2004/id/draft-ietf-html-spec-00.txt

INTERNET DRAFT                                         November 28, 1994
Expires in six months


                   HyperText Markup Language Specification - 2.0
                         <draft-ietf-html-spec-00.txt>

STATUS OF THIS MEMO

   This document is an Internet draft.  Internet drafts are
   working documents of the Internet Engineering Task Force
   (IETF), its areas, and  its working groups.  Note that
   other groups may also distribute working documents as
   Internet drafts.

   Internet drafts are draft documents valid for a maximum
   of six months and may be updated, replaced, or obsoleted
   by other documents at any time. It is inappropriate to
   use Internet drafts as reference material or to cite
   them other than as "work in progress."

   To learn the current status of any Internet-Draft,
   please check the "1id-abstracts.txt" listing contained
   in the Internet- Drafts Shadow Directories on
   ftp.is.co.za (Africa), nic.nordu.net (Europe),
   munnari.oz.au (Pacific Rim), ds.internic.net (US East
   Coast), or ftp.isi.edu (US West Coast).

   Distribution of this document is unlimited.  Please send
   comments to the HTML working group (HTML-WG) of the
   Internet Engineering Task Force (IETF) at <html-
   wg@oclc.org>. Discussions of the group are archived at
   URL: http://www.acl.lanl.gov/HTML_WG/archives.html.

Abstract

   The HyperText Markup Language (HTML) is a simple markup
   language used to create hypertext documents that are
   portable from one platform to another. HTML documents
   are SGML documents with generic semantics that are
   appropriate for representing information from a wide
   range of applications.  HTML markup can represent
   hypertext news, mail, documentation, and hypermedia;
   menus of options; database query results; simple
   structured documents with in-lined graphics; and
   hypertext views of existing bodies of information.

   HTML has been in use by the World Wide Web (WWW) global
   information initiative since 1990.  This specification
   corresponds to the legitimate capabilities of HTML in
   common use prior to June 1994. It is defined as an
   application of ISO Standard 8879:1986 Information
   Processing Text and Office Systems; Standard Generalized
   Markup Language (SGML). This specificiation is proposed
   as the Internet Media Type (RFC 1590) and MIME Content

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   Type (RFC 1521) called "text/html", or "text/html;
   version=2.0".

Contents

   Overview of HTML Specification........................  1

   HTML Specification.................................... 10

   Security Considerations............................... 52

   Obsolete and Proposed Features........................ 52

   HTML Document Type Definitions........................ 55

   DTD Element References................................ 71

   Glossary.............................................. 89

   References............................................ 92

   Acknowledgments....................................... 93

   Author's Addresses.................................... 95


1. Overview of HTML Specification

   This chapter is a summary of the HTML specification. See
   Section 2. for the complete specification.

   HTML describes the structure and organization of a
   document. It only suggests appropriate presentations of
   the document when processed.

   In HTML documents, tags define the start and end of
   headings, paragraphs, lists, character highlighting and
   links. Most HTML elements are identified in a document
   as a start tag, which gives the element name and
   attributes, followed by the content, followed by the end
   tag. Start tags are delimited by < and >, and end tags
   are delimited by </ and >.

   Example:

   <H1>This is a heading</H1>

   Every HTML document starts with a HTML document
   identifier which contains two sections, a head and a
   body. The head contains HTML elements which describe the

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   documents title, usage and relationship with other
   documents. The body contains other HTML elements with
   the entire text and graphics of the document.

   This overview briefly describes the syntax of HTML
   elements and provides an example HTML document.

   NOTE: The term "HTML user agent" is used in this
   document to describe applications that are used with
   HTML documents.

   1.1 HTML Elements

      1.1.1 Document Structure Elements

         HTML Identifier

            <HTML> ... </HTML>

            The HTML identifier defines the document as containing
            HTML elements. It contains only the Head and Body
            elements.

         Head

            <HEAD> ... </HEAD>

            The Head element contains HTML elements that describe
            the documents title, usage and relationship with other
            documents.

         Body

            <BODY> ... </BODY>

            The Body element contains the text and its associated
            HTML elements of the document.

         Example of Document Structure Elements

            <HTML>
            <HEAD>
            <TITLE>The Document's Title</TITLE>
            </HEAD>
            <BODY>
            The document's text.
            </BODY>

      1.1.2 Anchor Element


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         Anchor

            <A> ... </A>

            An anchor specifies a link to another location (<A
            HREF>) or the value to use when linking to this location
            from another location (<A NAME>):

            See <A HREF="http://www.hal.com/">HaL</A>'s
            information for more details.

            <A NAME="B">Section B</A> describes...
            ...
            See <A HREF="#B">Section B</A> for more information.

      1.1.3 Block Formatting Elements

         Address

            <ADDRESS> ... </ADDRESS>

            <ADDRESS>
            Newsletter editor<BR>
            J.R. Brown<BR>
            JimquickPost News, Jumquick, CT 01234<BR>
            Tel (123) 456 7890
            </ADDRESS>

         Body

            <BODY> ... </BODY>

            Place the <BODY> and </BODY> tags above and below the
            body of the text (not including the head) of your HTML
            document.

         Blockquote

            <BLOCKQUOTE>... </BLOCKQUOTE>
            I think it ends
            <BLOCKQUOTE>
            <P>Soft you now, the fair Ophelia. Nymph, in thy
            orisons,
            be all my sins remembered.
            </BLOCKQUOTE>
            but I am not sure.

         Head

            <HEAD> ... </HEAD>

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            Every HTML document must have a head, which provides a
            title. Example:

            <HTML>
            <HEAD>
            <TITLE>Introduction to HTML</TITLE>
            </HEAD>

         Headings

            <H1>This is a first level heading</H1>
            <P>There are six levels of headings.
            <H2>Second level heading</H2>
            <P>This text appears under the second level heading

         Horizontal Rule

            <HR>

            Inserts a horizontal rule that spans the width of the
            document. Example:

            <HR>
            <ADDRESS>November 28, 1994, CERN</ADDRESS>
            </BODY>

         HTML Identifier

            <HTML> ... </HTML>

            An HTML document begins with an <HTML> tag and ends with
            the </HTML> tag.

         Line Break

            <BR>

            Forces a line break:

            Name<BR>
            Street address<BR>
            City, State Zip

         Paragraph

            <P> ... </P>

            <H1>This Heading Precedes the Paragraph</H1>
            <P>This is the text of the first paragraph.

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            <P>This is the text of the second paragraph. Although
            you do not need to start paragraphs on new lines,
            maintaining this convention facilitates document
            maintenance.
            <P>This is the text of a third paragraph.

         Preformatted Text

            <PRE> ... </PRE>

            <PRE WIDTH="80">
            This is an example of preformatted text.
            </PRE>

         Title

            <TITLE> ... </TITLE>

            <TITLE>Title of document</TITLE>

       1.1.4 List Elements

         Definition List

            <DL> ... <DT>term<DD>definition... </DL>

            <DL>
            <DT>Term<DD>This is the first definition.
            <DT>Term<DD>This is the second definition.
            </DL>

         Directory List

            <DIR> ... <LI>List item... </DIR>

            <DIR>
            <LI>A-H<LI>I-M
            <LI>M-R<LI>S-Z
            </DIR>

         Menu List

            <MENU> ... <LI>List item... </MENU>

            <MENU>
            <LI>First item in the list.
            <LI>Second item in the list.
            <LI>Third item in the list.
            </MENU>


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         Ordered List

            <OL> ... <LI>List item... </OL>

            <OL>
            <LI>Click the Web button to open the Open the URL
            window.
            <LI>Enter the URL number in the text field of the Open
            URL window. The Web document you specified is displayed.
            <LI>Click highlighted text to move from one link to
            another.
            </OL>

         Unordered List

            <UL> ... <LI>List item... </UL>

            <UL>
            <LI>This is the first item in the list.
            <LI>This is the second item in the list.
            <LI>This is the third item in the list.
            </UL>

       1.1.5 Information Type and Character Formatting Elements

         Bold

            <B> ... </B>

            Suggests the rendering of the text in boldface. If
            boldface is not available, alternative mapping is
            allowed.

         Citation

            <CITE> ... </CITE>

            Specifies a citation; typically rendered as italic.

         Code

            <CODE> ... </CODE>

            Indicates an inline example of code; typically rendered
            as monospaced.. Do not confuse with the <PRE> tag.

         Emphasis

            <EM> ... </EM>


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            Provides typographic emphasis; typically rendered as
            italics.

         Italics

            <I> ... </I>

            Suggests the rendering of text in italic font, or
            slanted if italic is not available.

         Keyboard

            <KBD> ... </KBD>

            Indicates text typed by a user; typically rendered as
            monospaced.

         Sample

            <SAMP> ... </SAMP>

            Indicates a sequence of literal characters; typically
            rendered as monospaced..

         Strong

            <STRONG> ... </STRONG>

            Provides strong typographic emphasis; typically rendered
            as bold.

         Typetype

            <TT> ... </TT>

            Specifies that the text be rendered in fixed-width font.

         Variable

            <VAR> ... </VAR>

            Indicates a variable name; typically rendered as italic.

       1.1.6 Image Element

         Image

            <IMG>

            Inserts the referenced graphic image into the document

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            at the location where the element occurs.

            Example:

            <IMG SRC ="triangle.gif" ALT="Warning:"> Be sure to read
            these instructions.

      1.1.7 Form Elements

         Form

            <FORM> ... </FORM>

            The Form element contains nested elements (described
            below) which define user input controls and allow
            descriptive text to be displayed when the document is
            processed.

         Input

            <INPUT>

            Takes these attributes: ALIGN, MAXLENGTH, NAME, SIZE,
            SRC, TYPE, VALUE. The type attribute can define these
            field types: CHECKBOX, HIDDEN, IMAGE, PASSWORD, RADIO,
            RESET, SUBMIT, TEXT.

            Example:

            <FORM METHOD="POST" action="http://www.hal.com/sample">
            <P>Your name: <INPUT NAME="name" SIZE="48">
            <P>Male <INPUT NAME="gender" TYPE=RADIO VALUE="male">
            <P>Female <INPUT NAME="gender" TYPE=RADIO
            VALUE="female">
            </FORM>

         Option

            <OPTION>

            The Option element can only occur within a Select
            element. It represents one choice.

         Select

            <SELECT NAME="..." > ... </SELECT>

            Select provides a list of choices.

            <SELECT NAME="flavor">

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            <OPTION>Vanilla
            <OPTION>Strawberry
            <OPTION>Rum and Raisin
            <OPTION>Peach and Orange
            </SELECT>

         Textarea

            <TEXTAREA> ... </TEXTAREA>

            Textarea defines a multi-line text entry input control.
            It contains the initial text contents of the control.

            <TEXTAREA NAME="address" ROWS=64 COLS=6>
            HaL Computer Systems
            1314 Dell Avenue
            Campbell California 95008
            </TEXTAREA>

      1.1.8 Character Data in HTML

         Representing Graphic Characters in HTML

         Because of the way special characters are used in
         marking up HTML text, character strings are used to
         represent the less than (<) and greater than (>) symbols
         and the ampersand (&) as shown in Section 2.17.1.

         Representing ISO Latin-1 Characters in HTML

         HTML also allows references to any of the ISO Latin-1
         alphabet, using the names in the table ISO Latin-1
         Character Representations, which is derived from ISO
         Standard 8879:1986//ENTITIES Added Latin 1//EN. For
         details, see 2.17.2.

   1.2 Example HTML Document

      <HTML>
      <HEAD>
      <TITLE>Structural Example</TITLE>
      </HEAD>
      <BODY>
      <H1>First Header</H1>
      <P>This is a paragraph in the example HTML file.
      Keep in mind that the title does not appear in the
      document text, but that the header (defined by H1) does.
      <UL>
      <LI>First item in an unordered list.
      <LI>Second item in an unordered list.

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      </UL>
      <P>This is an additional paragraph. Technically, end
      tags
      are not required for paragraphs, although they are
      allowed.
      You can include character highlighting in a paragraph.
      <I>This sentence of the paragraph is in italics.</I>
      <IMG SRC ="triangle.gif" alt="Warning:"> Be sure to read
      these instructions.
      </BODY>
      </HTML>

2. HTML Specification

   HTML has been in use by the World Wide Web (WWW) global
   information initiative since 1990. This specification
   corresponds to the legitimate capabilities of HTML in
   common use prior to June 1994. It is defined as an
   application of ISO Standard 8879:1986: Standard
   Generalized Markup Language (SGML). This specification
   is proposed as the Internet Media Type (RFC 1590) and
   MIME Content Type (RFC 1521) called "text/html", or
   "text/html; version=2.0".

   This specification also includes:

   -  5.1 SGML Declaration for HTML

   -  5.1.1 Sample SGML Open Style Entity Catalog for HTML

   -  5.2 HTML DTD

   This specification is currently available on the World
   Wide Web at URL: http://www.hal.com/%7Econnolly/html-spec

   Please send comments to the discussion list at: html-
   wg@oclc.org

   2.1 Levels of Conformance

      Version 2.0 of the HTML specification introduces forms
      for user input of information, and adds a distinction
      between levels of conformance:

      Level 0

         Indicates the minimum conformance level. When writing
         Level 0 documents, authors can be confident that the
         rendering at different sites will reflect their intent.


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      Level 1

         Includes Level 0 features plus features such as
         highlighting and images.

      Level 2

         Includes all Level 0 and Level 1 features, plus forms.
         Features of higher levels, such as tables, figures, and
         mathematical formulae, are under discussion and are
         described as proposed where mentioned.

   2.2 Undefined Tag and Attribute Names

      An accepted networking principle is to be conservative
      in that which one produces, and liberal in that which
      one accepts. HTML user agents should be liberal except
      when verifying code. HTML generators should generate
      strictly conforming HTML.

      The behavior of HTML user agents reading HTML documents
      and discovering tag or attribute names which they do not
      understand should be to behave as though, in the case of
      a tag, the whole tag had not been there but its content
      had, or in the case of an attribute, that the attribute
      had not been present.

   2.3 Deprecated and Recommended Sections in DTDs

      In Section 5., optional "deprecated" and "recommended"
      sections are used. Conformance with this specification
      is defined with these sections disabled. In the liberal
      spirit of Section 2.2, HTML user agents reading HTML
      documents should accept syntax corresponding to the
      specification with "deprecated" turned on. HTML user
      agents generating HTML may in the spirit of
      conservation, generate documents that conform to the
      specification with the "recommended" sections turned on.

   2.4 HTML and MIME

      The World Wide Web initiative (WWW) links information
      throughout the world. To do this, WWW uses the Internet
      Hypertext Transfer Protocol (HTTP), which allows
      transfer representations to be negotiated between client
      and server. Results are returned in a MIME body part.

      HTML is one of the representations used by WWW, and is
      proposed as a MIME content type. The definition of the
      HTML Content-Type is text/html, and has three optional

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      parameters:

      Level

         The level parameter specifies the feature set used in
         the document. The level is an integer number, implying
         that any features of same or lower level may be present
         in the document. Levels are defined by this
         specification.

      Version

         To help avoid future compatibility problems, the version
         parameter may be used to give the version number of the
         specification to which the document conforms. The
         version number appears at the front of this document and
         within the public identifier for the SGML DTD.

      Character sets

         The charset parameter is reserved for future use. See
         Section 2.16 for a discussion of character sets and
         encodings in HTML.

         The actual character set used in the representation of
         an HTML document may be ISO 8859/1, or its 7-bit subset
         which is ISO 646. There is no obligation for an HTML
         document to contain any characters above decimal 127. It
         is possible that a transport medium such as electronic
         mail imposes constraints on the number of bits in a
         representation of a document, though the HTTP access
         protocol used by WWW always allows 8 bit transfer.

         When an HTML document is encoded using 7-bit characters,
         then the mechanisms of numeric character references (see
         Section 2.16.2) and character entity references (see
         Section 2.16.3) may be used to encode characters in the
         upper half of the ISO 8859/1 Latin-1 set. In this way,
         documents may be prepared which are suitable for mailing
         through 7-bit limited systems.

            NOTE: ISO 646 is, for all intents and purposes,
            equivalent to the ANSI standard for ASCII (American
            Standard Code for Information Interchange). The only
            notable differences between the two standards are the
            names assigned to the control characters that occupy
            positions 00 through 31 and position 127 (decimal) in
            that encoding. For encoding HTML documents, only three
            control characters in ISO 646 or ASCII are relevant (see
            Section 2.16.2). These are Carriage Return (CR) at

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            position 13, Line Feed (LF) at position 10, and
            Horizontal Tab (HT) at position 11.

   2.5 Understanding HTML and SGML

      HTML is an application of ISO Standard 8879:1986 -
      Standard Generalized Markup Language (SGML). SGML is a
      system for defining structured document types, and
      markup languages to represent instances of those
      document types. The SGML declaration for HTML is given
      in Section 5.1. It is implicit among HTML user agents.

      If the HTML specification and SGML standard conflict,
      the SGML standard is definitive.

      Every SGML document has three parts:

      SGML declaration

         Binds SGML processing quantities and syntax token names
         to specific values. For example, the SGML declaration in
         the HTML DTD specifies that the string that opens an end
         tag is </ and the maximum length of a name is 72
         characters.

      Prologue

         Includes one or more document type declarations, which
         specify the element types, element relationships and
         attributes.

      Instance

         Contains the data and markup of the document.

      HTML refers to the document type as well as the markup
      language for representing instances of that document
      type.

   2.6 Working with Structured Text

      An HTML document is like a text file, except that some
      of the characters are markup. Markup (tags) define the
      structure of the document.

      To identify information as HTML, each HTML document
      should start with the prologue:

      <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN//2.0">


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      NOTE: If the body of a text/html body part does not
      begin with a document type declaration, an HTML user
      agent should infer the above document type declaration.

      HTML documents should also contain an <HTML> tag at the
      beginning of the file, after the prologue, and an
      </HTML> tag at the end. Within those tags, an HTML
      document is organized as a head and a body, much like
      memo or a mail message. Within the head, you can specify
      the title and other information about the document.
      Within the body, you can structure text into paragraphs
      and lists as well as highlighting phrases and creating
      links. You do this using HTML elements.

         NOTE: Technically, the start and end tags for HTML,
         Head, and Body elements are omissible; however, this is
         not recommended since the head/ body structure allows an
         implementation to determine certain properties of a
         document, such as the title, without parsing the entire
         document.

   2.6.1 HTML Elements

      In HTML documents, tags define the start and end of
      headings, paragraphs, lists, character highlighting and
      links. Most HTML elements are identified in a document
      as a start tag, which gives the element name and
      attributes, followed by the content, followed by the end
      tag. Start tags are delimited by < and >, and end tags
      are delimited by </ and >.

      Example:

      <H1>This is a Heading</H1>

      Some elements only have a start tag without an end tag.
      For example, to create a line break, you use the <BR>
      tag. Additionally, the end tags of some other elements,
      such as Paragraph (<P>), List Item (<LI>), Definition
      Term (<DT>), and Definition Description (<DD>) elements,
      may be omitted.

      The content of an element is a sequence of characters
      and nested elements. Some elements, such as anchors,
      cannot be nested. Anchors and character highlighting may
      be put inside other constructs.

      NOTE: The SGML declaration for HTML specifies SHORTTAG
      YES, which means that there are other valid syntaxes for
      tags, such as NET tags, <EM/.../; empty start tags, <>;

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      and empty end tags, </>. Until support for these idioms
      is widely deployed, their use is strongly discouraged.

   2.6.2 Names

      A name consists of a letter followed by up to 71
      letters, digits, periods, or hyphens. Element names are
      not case sensitive, but entity names are. For example,
      <BLOCKQUOTE>, <BlockQuote>, and <blockquote> are
      equivalent, whereas &amp; is different from &AMP;.

      In a start tag, the element name must immediately follow
      the tag open delimiter <.

   2.6.3 Attributes

      In a start tag, white space and attributes are allowed
      between the element name and the closing delimiter. An
      attribute typically consists of an attribute name, an
      equal sign, and a value (although some attributes may be
      just a value). White space is allowed around the equal
      sign.

      The value of the attribute may be either:

      -  A string literal, delimited by single quotes or
         double quotes and not containing any occurrences of the
         delimiting character.

      -  A name token (a sequence of letters, digits,
         periods, or hyphens)

      In this example, A is the element name, HREF is the
      attribute name, and http://host/dir/file.html is the
      attribute value:

      <A HREF="http://host/dir/file.html">

         NOTE: Some non-SGML implementations consider any
         occurrence of the > character to signal the end of a
         tag. For compatibility with such implementations, when >
         appears in an attribute value, you may want to represent
         it with an entity or numeric character reference (see
         Section 2.17.1), such as: <IMG SRC="eq1.ps" alt="a &#62;
         b">

      To put quotes inside of quotes, you may use the
      character representation &quot; as in:

      <IMG SRC="image.ps" alt="First &quot;real&quot;

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      example">

      The length of an attribute value is limited to 1024
      characters after replacing entity and numeric character
      references.

         NOTE: Some non-SGML implementations allow any character
         except space or > in a name token. Attributes values
         must be quoted only if they don't satisfy the syntax for
         a name token.

      Attributes with a declared value of NAME, such as ISMAP
      and COMPACT, may be written using a minimized syntax.
      The markup:

         <UL COMPACT="compact">

      can be written using a minimized syntax:

         <UL COMPACT>

         NOTE: Some non-SGML implementations only understand the
         minimized syntax.

   2.6.4 Special Characters

      The characters between the tags represent text in the
      ISO-Latin-1 character set, which is a superset of ASCII.
      Because certain characters will be interpreted as
      markup, they should be represented by markup - entity or
      numeric character references. For more information, see
      Section 2.16.

   2.6.5 Comments

      To include comments in an HTML document that will be
      ignored by the HTML user agent, surround them with <!--
      and -->. After the comment delimiter, all text up to the
      next occurrence of --> is ignored. Hence comments cannot
      be nested. White space is allowed between the closing --
      and >, but not between the opening <! and --.

      For example:

      <HEAD>
      <TITLE>HTML Guide: Recommended Usage</TITLE>
      <!-- Id: Text.html,v 1.6 1994/04/25 17:33:48 connolly Exp -->
      </HEAD>

      NOTE: Some historical HTML user agents incorrectly

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      consider a > sign to terminate a comment.

   2.7 The Head Element and Related Elements

      Only certain elements are allowed in the head of an HTML
      document. Elements that may be included in the head of a
      document are:

      2.7.1 Head

         <HEAD> ... </HEAD>

         Level 0

         The head of an HTML document is an unordered collection
         of information about the document. It requires the Title
         element between <HEAD> and </HEAD> tags in this format:

         <HEAD>
         <TITLE>Introduction to HTML</TITLE>
         </HEAD>

       2.7.2 Base

         Level 0

         The Base element allows the URL of the document itself
         to be recorded in situations in which the document may
         be read out of context. URLs within the document may be
         in a "partial" form relative to this base address.

         Where the base address is not specified, the HTML user
         agent uses the URL it used to access the document to
         resolve any relative URLs.

         The Base element has one attribute, HREF, which
         identifies the URL.

      2.7.3 Isindex

         Level 0

         The Isindex element tells the HTML user agent that the
         document is an index document. As well as reading it,
         the reader may use a keyword search.

         The document can be queried with a keyword search by
         adding a question mark to the end of the document
         address, followed by a list of keywords separated by
         plus signs.

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         NOTE: The Isindex element is usually generated
         automatically by a server. If added manually to an HTML
         document, the HTML user agent assumes that the server
         can handle a search on the document. To use the Isindex
         element, the server must have a search engine that
         supports this element.

      2.7.4 Link

         Level 1

         The Link element indicates a relationship between the
         document and some other object. A document may have any
         number of Link elements.

         The Link element is empty (does not have a closing tag),
         but takes the same attributes as the Anchor element.

         Typical uses are to indicate authorship, related indexes
         and glossaries, older or more recent versions, etc.
         Links can indicate a static tree structure in which the
         document was authored by pointing to a "parent" and
         "next" and "previous" document, for example.

         Servers may also allow links to be added by those who do
         not have the right to alter the body of a document.

      2.7.5 Nextid

         Level 0

         The Nextid element is a parameter read by and generated
         by text editing software to create unique identifiers.
         This tag takes a single attribute which is the next
         document-wide alpha-numeric identifier to be allocated
         of the form z123:

         <NEXTID N=Z27>

         When modifying a document, existing anchor identifiers
         should not be reused, as these identifiers may be
         referenced by other documents. Human writers of HTML
         usually use mnemonic alphabetical identifiers.

         HTML user agents may ignore the Nextid element. Support
         for the Nextid element does not impact HTML user agents
         in any way.

      2.7.6 Title

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         <TITLE> ... </TITLE>

         Level 0

         Every HTML document must contain a Title element. The
         title should identify the contents of the document in a
         global context, and may be used in a history lists and
         as a label for the window displaying the document.
         Unlike headings, titles are not typically rendered in
         the text of a document itself.

         The Title element must occur within the head of the
         document, and may not contain anchors, paragraph tags,
         or highlighting. Only one title is allowed in a
         document.

         NOTE: The length of a title is not limited; however,
         long titles may be truncated in some applications. To
         minimize this possibility, titles should be fewer than
         64 characters. Also keep in mind that a short title,
         such as Introduction, may be meaningless out of context.
         An example of a meaningful title might be "Introduction
         to HTML Elements."

      2.7.7 Meta

         Level 1

         The Meta element is used within the Head element to
         embed document meta-information not defined by other
         HTML elements. Such information can be extracted by
         servers/clients for use in identifying, indexing, and
         cataloging specialized document meta-information.

         Although it is generally preferable to use named
         elements that have well-defined semantics for each type
         of meta-information, such as a title, this element is
         provided for situations where strict SGML parsing is
         necessary and the local DTD is not extensible.

         In addition, HTTP servers can read the content of the
         document head to generate response headers corresponding
         to any elements defining a value for the attribute HTTP-
         EQUIV. This provides document authors a mechanism (not
         necessarily the preferred one) for identifying
         information that should be included in the response
         headers for an HTTP request.

         Attributes of the Meta element:

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         HTTP-EQUIV

            This attribute binds the element to an HTTP response
            header. If the semantics of the HTTP response header
            named by this attribute is known, then the contents can
            be processed based on a well-defined syntactic mapping
            whether or not the DTD includes anything about it. HTTP
            header names are not case sensitive. If not present, the
            NAME attribute should be used to identify this meta-
            information and it should not be used within an HTTP
            response header.

         NAME

            Meta-information name. If the NAME attribute is not
            present, the name can be assumed equal to the value of
            HTTP-EQUIV.

         CONTENT

            The meta-information content to be associated with the
            given name and/or HTTP response header.

         Examples

         If the document contains:

         <META HTTP-EQUIV="Expires" CONTENT="Tue, 04 Dec 1993 21:29:02
         GMT">
         <META HTTP-EQUIV="Keywords" CONTENT="Fred, Barney">
         <META HTTP-EQUIV="Reply-
         to" content="fielding@ics.uci.edu (Roy Fielding)">

         Expires: Tue, 04 Dec 1993 21:29:02 GMT
         Keywords: Fred, Barney
         Reply-to: fielding@ics.uci.edu (Roy Fielding)

         When the HTTP-EQUIV attribute is not present, the server
         should not generate an HTTP response header for this
         meta-information; e.g.,

         <META NAME="IndexType" CONTENT="Service">

         Do not use the Meta element to define information that
         should be associated with an existing HTML element.

         Example of an inappropriate use of the Meta element:

         <META NAME="Title" CONTENT="The Etymology of Dunsel">

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         Do not name an HTTP-EQUIV equal to a response header
         that should typically only be generated by the HTTP
         server. Some inappropriate names are "Server", "Date",
         and "Last-modified". Whether a name is inappropriate
         depends on the particular server implementation. It is
         recommended that servers ignore any Meta elements that
         specify HTTP-equivalents equal (case-insensitively) to
         their own reserved response headers.

   2.8 The Body Element and Related Elements

      The following elements may be included in the body of an
      HTML document:

      2.8.1 Body

         <BODY> ... </BODY>

         Level 0

         The Body element identifies the body component of an
         HTML document. Specifically, the body of a document may
         contain links, text, and formatting information within
         <BODY> and </BODY> tags.

      2.8.2 Address

         <ADDRESS> ... </ADDRESS>

         Level 0

         The Address element specifies such information as
         address, signature and authorship, often at the top or
         bottom of a document.

         Typically, an Address is rendered in an italic typeface
         and may be indented. The Address element implies a
         paragraph break before and after.

         Example of use:

         <ADDRESS>
         Newsletter editor<BR>
         J.R. Brown<BR>
         JimquickPost News, Jumquick, CT 01234<BR>
         Tel (123) 456 7890
         </ADDRESS>

      2.8.3 Anchor

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         <A> ... </A>

         Level 0

         An anchor is a marked text that is the start and/or
         destination of a hypertext link. Anchor elements are
         defined by the <A> tag. The <A> tag accepts several
         attributes, but either the NAME or HREF attribute is
         required.

         Attributes of the <A> tag:

         HREF

            Level 0

            If the HREF attribute is present, the text between the
            opening and closing anchor tags becomes hypertext. If
            this hypertext is selected by readers, they are moved to
            another document, or to a different location in the
            current document, whose network address is defined by
            the value of the HREF attribute.

            Example:

            See <A HREF="http://www.hal.com/">HaL</A>'s information
            for more details.

            In this example, selecting "HaL" takes the reader to a
            document at http://www.hal.com. The format of the
            network address is specified in the URI specification
            for print readers.

            With the HREF attribute, the form HREF="#identifier" can
            refer to another anchor in the same document.

            Example:

            The <A HREF="document.html#glossary">glossary</A>
            defines terms used in this document.

            In this example, selecting "glossary" takes the reader
            to another anchor (i.e., <A
            NAME="glossary">Glossary</A>) in the same document
            (document.html). The NAME attribute is described below.
            If the anchor is in another document, the HREF attribute
            may be relative to the document's address or the
            specified base address (see 2.7.2 Base).


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         NAME

            Level 0

            If present, the NAME attribute allows the anchor to be
            the target of a link. The value of the NAME attribute is
            an identifier for the anchor. Identifiers are arbitrary
            strings but must be unique within the HTML document.

            Example of use:

            <A NAME="coffee">Coffee</A> is an example of ...
            ...
            An example of this is <A HREF="#coffee">coffee</A>.

            Another document can then make a reference explicitly to
            this anchor by putting the identifier after the address,
            separated by a hash sign:

            <A NAME="drinks.html#coffee">

         TITLE

            Level 1

            The TITLE attribute is informational only. If present,
            the TITLE attribute should provide the title of the
            document whose address is given by the HREF attribute.
 
            The TITLE attribute is useful for at least two reasons.
            The HTML user agent may display the title of the
            document prior to retrieving it, for example, as a
            margin note or on a small box while the mouse is over
            the anchor, or while the document is being loaded.
            Another reason is that documents that are not marked up
            text, such as graphics, plain text and Gopher menus, do
            not have titles. The TITLE attribute can be used to
            provide a title to such documents. When using the TITLE
            attribute, the title should be valid and unique for the
            destination document.

         REL

            Level 1

            The REL attribute gives the relationship(s) described by
            the hypertext link from the anchor to the target. The
            value is a comma-separated list of relationship values.
            Values and their semantics will be registered by the
            HTML registration authority. The default relationship if

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            none other is given is void. The REL attribute is only
            used when the HREF attribute is present.

         REV

            Level 1

            The REV attribute is the same as the REL attribute, but
            the semantics of the link type are in the reverse
            direction. A link from A to B with REL="X" expresses the
            same relationship as a link from B to A with REV="X". An
            anchor may have both REL and REV attributes.

         URN

            Level 1

            If present, the URN attribute specifies a uniform
            resource name (URN) for a target document. The format of
            URNs is under discussion (1994) by various working
            groups of the Internet Engineering Task Force.

         METHODS

            The METHODS attributes of anchors and links provide
            information about the functions that the user may
            perform on an object. These are more accurately given by
            the HTTP protocol when it is used, but it may, for
            similar reasons as for the TITLE attribute, be useful to
            include the information in advance in the link. For
            example, the HTML user agent may chose a different
            rendering as a function of the methods allowed; for
            example, something that is searchable may get a
            different icon.

            The value of the METHODS attribute is a comma separated
            list of HTTP methods supported by the object for public
            use.

            See also: 2.7.4 Link

      2.8.4 Blockquote

         <BLOCKQUOTE> ... </BLOCKQUOTE>

         Level 0

         The Blockquote element is used to contain text quoted
         from another source.


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         A typical rendering might be a slight extra left and
         right indent, and/or italic font. The Blockquote element
         causes a paragraph break, and typically provides space
         above and below the quote.

         Single-font rendition may reflect the quotation style of
         Internet mail by putting a vertical line of graphic
         characters , such as the greater than symbol (>), in the
         left margin.

         Example of use:

         I think the poem ends
         <BLOCKQUOTE>
         <P>Soft you now, the fair Ophelia. Nymph,
         in thy orisons, be all my sins remembered.
         </BLOCKQUOTE>
         but I am not sure.

      2.8.5 Headings

         <H1> ... </H1> through <H6> ... </H6>
   
         Level 0

         HTML defines six levels of heading. A Heading element
         implies all the font changes, paragraph breaks before
         and after, and white space necessary to render the
         heading.

         The highest level of headings is H1, followed by H2 ...
         H6.

         Example of use:

         <H1>This is a heading</H1>
         Here is some text
         <H2>Second level heading</H2>
         Here is some more text.

         The rendering of headings is determined by the HTML user
         agent, but typical renderings are:

         <H1> ... </H1>

            Bold, very-large font, centered. One or two blank lines
            above and below.

         <H2> ... </H2>


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            Bold, large font, flush-left. One or two blank lines
            above and below.

         <H3> ... </H3>

            Italic, large font, slightly indented from the left
            margin. One or two blank lines above and below.

         <H4> ... </H4>

            Bold, normal font, indented more than H3. One blank line
            above and below.

         <H5> ... </H5>

            Italic, normal font, indented as H4. One blank line
            above.

         <H6> ... </H6>

            Bold, indented same as normal text, more than H5. One
            blank line above.

         Although heading levels can be skipped (for example,
         from H1 to H3), this practice is discouraged as skipping
         heading levels may produce unpredictable results when
         generating other representations from HTML.

   2.9 Overview of Character-Level Elements

      Level 2 (all elements)

      Character-level elements are used to specify either the
      logical meaning or the physical appearance of marked
      text without causing a paragraph break. Like most other
      elements, character-level elements include both opening
      and closing tags. Only the characters between the tags
      are affected:

      This is <EM>emphasized</EM> text.

      Character-level tags may be ignored by minimal HTML
      applications.

      Character-level tags are interpreted from left to right
      as they appear in the flow of text. Level 1 HTML user
      agents must render highlighted text distinctly from
      plain text. Additionally, EM content must be rendered as
      distinct from STRONG content, and B content must
      rendered as distinct from I content.

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      Character-level elements may be nested within the
      content of other character-level elements; however, HTML
      user agents are not required to render nested character-
      level elements distinctly from non-nested elements:

      plain <B>bold <I>italic</I></B>
      may the rendered the same as
      plain <B>bold </B><I>italic</I>

      Note that typical renderings for information type
      elements vary between applications. If a specific
      rendering is necessary, for example, when referring to a
      specific text attribute as in "The italic parts are
      mandatory", a formating element can be used to ensure
      that the intended rendered is used where possible.

   2.10 Information Type Elements

      Note that different information type elements may be
      rendered in the same way.

      2.10.1 Citation

         <CITE>...</CITE>

         The Citation element specifies a citation; typically
         rendered as italics.

      2.10.2 Code

         <CODE> ... </CODE>

         The Code element indicates an example of code; typically
         rendered as monospaced . Do not confuse with the
         Preformatted Text element.

      2.10.3 Emphasis

         <EM> ... </EM>

         The Emphasis element indicates typographic emphasis,
         typically rendered as italics.

      2.10.4 Keyboard

         <KBD> ... </KBD>

         The Keyboard element indicates text typed by a user;
         typically rendered as monospaced . It might commonly be

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         used in an instruction manual.

      2.10.5 Sample

         <SAMP> ... </SAMP>

         The Sample element indicates a sequence of literal
         characters; typically rendered as  monospaced.

      2.10.6 Strong

         <STRONG> ... </STRONG>

         The Strong element indicates strong typographic
         emphasis, typically rendered in bold.

      2.10.7 Variable

         <VAR> ... </VAR>

         The Variable element indicates a variable name;
         typically rendered as italic.

   2.11 Character Format Elements

      Character format elements are used to specify the format
      of marked text. Example of use:

      2.11.1 Bold

         <B> ... </B>

         The Bold element specifies that the text should be
         rendered in boldface, where available. Otherwise,
         alternative mapping is allowed.

      2.11.2 Italic

         <I> ... </I>

         The Italic element specifies that the text should be
         rendered in italic font, where available. Otherwise,
         alternative mapping is allowed.

      2.11.3 Teletype

         <TT> ... </TT>

         The Teletype element specifies that the text should be
         rendered in fixed-width typewriter font.

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   2.12 Image Element

      <IMG>

      Level 0

      The Image element is used to incorporate in-line
      graphics (typically icons or small graphics) into an
      HTML document. This element cannot be used for embedding
      other HTML text.

      HTML user agents that cannot render in-line images
      ignore the Image element unless it contains the ALT
      attribute. Note that some HTML user agents can render
      linked graphics but not in-line graphics. If a graphic
      is essential, you may want to create a link to it rather
      than to put it in-line. If the graphic is not essential,
      then the Image element is appropriate.

      The Image element, which is empty (no closing tag), has
      these attributes:

      ALIGN

         The ALIGN attribute accepts the values TOP or MIDDLE or
         BOTTOM, which specifies if the following line of text is
         aligned with the top, middle, or bottom of the graphic.

      ALT

         Optional text as an alternative to the graphic for
         rendering in non-graphical environments. Alternate text
         should be provided whenever the graphic is not rendered.
         Alternate text is mandatory for Level 0 documents.
         Example of use:

         <IMG SRC="triangle.gif" ALT="Warning:"> Be sure to read
         these instructions.

      ISMAP

         The ISMAP (is map) attribute identifies an image as an
         image map. Image maps are graphics in which certain
         regions are mapped to URLs. By clicking on different
         regions, different resources can be accessed from the
         same graphic. Example of use:

         <A HREF="http://machine/htbin/imagemap/sample">
         <IMG SRC="sample.gif" ISMAP>

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         </A>
  
      SRC

         The value of the SRC attribute is the URL of the
         document to be embedded; only images can be embedded,
         not HTML text. Its syntax is the same as that of the
         HREF attribute of the <A> tag. SRC is mandatory. Image
         elements are allowed within anchors.

         Example of use:

         <IMG SRC ="triangle.gif">Be sure to read these
         instructions.

   2.13 List Elements

      HTML supports several types of lists, all of which may
      be nested.

      2.13.1 Definition List

         <DL> ... </DL>

         Level 0

         A definition list is a list of terms and corresponding
         definitions. Definition lists are typically formatted
         with the term flush-left and the definition, formatted
         paragraph style, indented after the term.

         Example of use:

         <DL>
         <DT>Term<DD>This is the definition of the first term.
         <DT>Term<DD>This is the definition of the second term.
         </DL>

         If the DT term does not fit in the DT column (one third
         of the display area), it may be extended across the page
         with the DD section moved to the next line, or it may be
         wrapped onto successive lines of the left hand column.

         Single occurrences of a <DT> tag without a subsequent
         <DD> tag are allowed, and have the same significance as
         if the <DD> tag had been present with no text.

         The opening list tag must be <DL> and must be
         immediately followed by the first term (<DT>).


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         The definition list type can take the COMPACT attribute,
         which suggests that a compact rendering be used, because
         the list items are small and/or the entire list is
         large.

         Unless you provide the COMPACT attribute, the HTML user
         agent may leave white space between successive DT, DD
         pairs.The COMPACT attribute may also reduce the width of
         the left-hand (DT) column.

         If using the COMPACT attribute, the opening list tag
         must be <DL COMPACT>, which must be immediately followed
         by the first <DT> tag:

         <DL COMPACT>
         <DT>Term<DD>This is the first definition in compact format.
         <DT>Term<DD>This is the second definition in compact format.
         </DL>

      2.13.2 Directory List

         <DIR> ... </DIR>

         Level 0

         A Directory List element is used to present a list of
         items containing up to 20 characters each. Items in a
         directory list may be arranged in columns, typically 24
         characters wide. If the HTML user agent can optimize the
         column width as function of the widths of individual
         elements, so much the better.

         A directory list must begin with the <DIR> tag which is
         immediately followed by a <LI> (list item) tag:

         <DIR>
         <LI>A-H<LI>I-M
         <LI>M-R<LI>S-Z
         </DIR>

      2.13.3 Menu List

         <MENU> ... </MENU>

         Level 0

         A menu list is a list of items with typically one line
         per item. The menu list style is more compact than the
         style of an unordered list.


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         A menu list must begin with a <MENU> tag which is
         immediately followed by a <LI> (list item) tag:

         <MENU>
         <LI>First item in the list.
         <LI>Second item in the list.
         <LI>Third item in the list.
         </MENU>

      2.13.4 Ordered List

         <OL> ... </OL>
  
         Level 0

         The Ordered List element is used to present a numbered
         list of items, sorted by sequence or order of
         importance.

         An ordered list must begin with the <OL> tag which is
         immediately followed by a <LI> (list item) tag:

         <OL>
         <LI>Click the Web button to open the Open the URL window.
         <LI>Enter the URL number in the text field of the Open URL
         window. The Web document you specified is displayed.
         <LI>Click highlighted text to move from one link to another.
         </OL>

         The Ordered List element can take the COMPACT attribute,
         which suggests that a compact rendering be used.

      2.13.5 Unordered List

         <UL> ... </UL>

         Level 0

         The Unordered List element is used to present a list of
         items which is typically separated by white space and/or
         marked by bullets.

         An unordered list must begin with the <UL> tag which is
         immediately followed by a <LI> (list item) tag:

         <UL>
         <LI>First list item
         <LI>Second list item
         <LI>Third list item
         </UL>

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   2.14 Other Elements

      2.14.1 Paragraph

         <P>

         Level 0

         The Paragraph element indicates a paragraph. The exact
         indentation, leading, etc. of a paragraph is not defined
         and may be a function of other tags, style sheets, etc.

         Typically, paragraphs are surrounded by a vertical space
         of one line or half a line. This is typically not the
         case within the Address element and or is never the case
         within the Preformatted Text element. With some HTML
         user agents, the first line in a paragraph is indented.

         Example of use:

         <H1>This Heading Precedes the Paragraph</H1>
         <P>This is the text of the first paragraph.
         <P>This is the text of the second paragraph. Although you
         do not need to start paragraphs on new lines, maintaining
         this convention facilitates document maintenance.
         <P>This is the text of a third paragraph.

      2.14.2 Preformatted Text

         <PRE> ... </PRE>

         Level 0

         The Preformatted Text element presents blocks of text in
         fixed-width font, and so is suitable for text that has
         been formatted on screen.

         The <PRE> tag may be used with the optional WIDTH
         attribute, which is a Level 1 feature. The WIDTH
         attribute specifies the maximum number of characters for
         a line and allows the HTML user agent to select a
         suitable font and indentation. If the WIDTH attribute is
         not present, a width of 80 characters is assumed. Where
         the WIDTH attribute is supported, widths of 40, 80 and
         132 characters should be presented optimally, with other
         widths being rounded up.

         Within preformatted text:


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         -  Line breaks within the text are rendered as a move
            to the beginning of the next line.

         -  The <P> tag should not be used. If found, it should
            be rendered as a move to the beginning of the next line.

         -  Anchor elements and character highlighting elements
            may be used.

         -  Elements that define paragraph formatting
            (headings, address, etc.) must not be used.

         -  The ASCII horizontal tab character must be
            interpreted as the smallest positive nonzero number of
            spaces which will leave the number of characters so far
            on the line as a multiple of 8. Its use is not
            recommended however.

         NOTE: References to the "beginning of a new line" do not
         imply that the renderer is forbidden from using a
         constant left indent for rendering preformatted text.
         The left indent may be constrained by the width
         required.

         Example of use:

         <PRE WIDTH="80">

         This is an example line.

         </PRE>

         NOTE: Within a Preformatted Text element, the constraint
         that the rendering must be on a fixed horizontal
         character pitch may limit or prevent the ability of the
         HTML user agent to render highlighting elements
         specially.

      2.14.3 Line Break

         <BR>

         Level 0

         The Line Break element specifies that a new line must be
         started at the given point. A new line indents the same
         as that of line-wrapped text.

         Example of use:


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         <P>
         Pease porridge hot<BR>
         Pease porridge cold<BR>
         Pease porridge in the pot<BR>
         Nine days old.

      2.14.4 Horizontal Rule

         <HR>

         Level 0

         A Horizontal Rule element is a divider between sections
         of text such as a full width horizontal rule or
         equivalent graphic.

         Example of use:

         <HR>
         <ADDRESS>November 28, 1994, CERN</ADDRESS>
         </BODY>

   2.15 Form Elements

      Forms are created by placing input fields within
      paragraphs, preformatted/literal text, and lists. This
      gives considerable flexibility in designing the layout
      of forms.

      The following elements (all are HTML 2 features) are
      used to create forms:

         FORM

            A form within a document.

         INPUT

            One input field.

         OPTION

            One option within a Select element.

         SELECT

            A selection from a finite set of options.

         TEXTAREA


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            A multi-line input field.

      Each variable field is defined by an Input, Textarea, or
      Option element and must have an NAME attribute to
      identify its value in the data returned when the form is
      submitted.

      Example of use (a questionnaire form):

         <H1>Sample Questionnaire</H1>
         <P>Please fill out this questionnaire:
         <FORM METHOD="POST" ACTION="http://www.hal.com/sample">
         <P>Your name: <INPUT NAME="name" size="48">
         <P>Male <INPUT NAME="gender" TYPE=RADIO VALUE="male">
         <P>Female <INPUT NAME="gender" TYPE=RADIO VALUE="female">
         <P>Number in family: <INPUT NAME="family" TYPE=text>
         <P>Cities in which you maintain a residence:
         <UL>
         <LI>Kent <INPUT NAME="city" TYPE=checkbox VALUE="kent">
         <LI>Miami <INPUT NAME="city" TYPE=checkbox VALUE="miami">
         <LI>Other <TEXTAREA NAME="other" cols=48 rows=4></textarea>
         </UL>
         Nickname: <INPUT NAME="nickname" SIZE="42">
         <P>Thank you for responding to this questionnaire.
         <P><INPUT TYPE=SUBMIT> <INPUT TYPE=RESET>
         </FORM>

      In the example above, the <P> and <UL> tags have been
      used to lay out the text and input fields. The HTML user
      agent is responsible for handling which field will
      currently get keyboard input.

      Many platforms have existing conventions for forms, for
      example, using Tab and Shift keys to move the keyboard
      focus forwards and backwards between fields, and using
      the Enter key to submit the form. In the example, the
      SUBMIT and RESET buttons are specified explicitly with
      special purpose fields. The SUBMIT button is used to e-
      mail the form or send its contents to the server as
      specified by the ACTION attribute, while RESET resets
      the fields to their initial values. When the form
      consists of a single text field, it may be appropriate
      to leave such buttons out and rely on the Enter key.

      The Input element is used for a large variety of types
      of input fields.

      To let users enter more than one line of text, use the
      Textarea element.


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      2.15.1 Representing Choices

         The radio button and checkbox types of input field can
         be used to specify multiple choice forms in which every
         alternative is visible as part of the form. An
         alternative is to use the Select element which is
         typically rendered in a more compact fashion as a pull
         down combo list.

      2.15.2 Form

         <FORM> ... </FORM>

         Level 2

         The Form element is used to delimit a data input form.
         There can be several forms in a single document, but the
         Form element can't be nested.

         The ACTION attribute is a URL specifying the location to
         which the contents of the form is submitted to elicit a
         response. If the ACTION attribute is missing, the URL of
         the document itself is assumed. The way data is
         submitted varies with the access protocol of the URL,
         and with the values of the METHOD and ENCTYPE
         attributes.

         In general:

         -  the METHOD attribute selects variations in the
            protocol.

         -  the ENCTYPE attribute specifies the format of the
            submitted data in case the protocol does not impose a
            format itself.

         The Level 2 specification defines and requires support
         for the HTTP access protocol only.

         When the ACTION attribute is set to an HTTP URL, the
         METHOD attribute must be set to an HTTP method as
         defined by the HTTP method specification in the IETF
         draft HTTP standard. The default METHOD is GET, although
         for many applications, the POST method may be preferred.
         With the post method, the ENCTYPE attribute is a MIME
         type specifying the format of the posted data; by
         default, is application/x-www-form-urlencoded.

         Under any protocol, the submitted contents of the form
         logically consist of name/value pairs. The names are

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         usually equal to the NAME attributes of the various
         interactive elements in the form.

         NOTE: The names are not guaranteed to be unique keys,
         nor are the names of form elements required to be
         distinct. The values encode the user's input to the
         corresponding interactive elements. Elements capable of
         displaying a textual or numerical value will return a
         name/value pair even when they receive no explicit user
         input.

      2.15.3 Input

      <INPUT>

      Level 2

      The Input element represents a field whose contents may
      be edited by the user.

      Attributes of the Input element:

      ALIGN

         Vertical alignment of the image. For use only with
         TYPE=IMAGE in HTML level 2. The possible values are
         exactly the same as for the ALIGN attribute of the image
         element.

      CHECKED

         Indicates that a checkbox or radio button is selected.
         Unselected checkboxes and radio buttons do not return
         name/value pairs when the form is submitted.

      MAXLENGTH

         Indicates the maximum number of characters that can be
         entered into a text field. This can be greater than
         specified by the SIZE attribute, in which case the field
         will scroll appropriately. The default number of
         characters is unlimited.

      NAME

         Symbolic name used when transferring the form's
         contents. The NAME attribute is required for most input
         types and is normally used to provide a unique
         identifier for a field, or for a logically related group
         of fields.

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      SIZE

         Specifies the size or precision of the field according
         to its type. For example, to specify a field with a
         visible width of 24 characters:

         INPUT TYPE=text SIZE="24"

      SRC

         A URL or URN specifying an image. For use only with
         TYPE=IMAGE in HTML Level 2.

      TYPE

         Defines the type of data the field accepts. Defaults to
         free text. Several types of fields can be defined with
         the type attribute:

         CHECKBOX

            Used for simple Boolean attributes, or for attributes
            that can take multiple values at the same time. The
            latter is represented by a number of checkbox fields
            each of which has the same name. Each selected checkbox
            generates a separate name/value pair in the submitted
            data, even if this results in duplicate names. The
            default value for checkboxes is "on".

         HIDDEN

            No field is presented to the user, but the content of
            the field is sent with the submitted form. This value
            may be used to transmit state information about
            client/server interaction.

         IMAGE

            An image field upon which you can click with a pointing
            device, causing the form to be immediately submitted.
            The coordinates of the selected point are measured in
            pixel units from the upper-left corner of the image, and
            are returned (along with the other contents of the form)
            in two name/value pairs. The x-coordinate is submitted
            under the name of the field with .x appended, and the y-
            coordinate is submitted under the name of the field with
            .y appended. Any VALUE attribute is ignored. The image
            itself is specified by the SRC attribute, exactly as for
            the Image element.

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            NOTE: In a future version of the HTML specification, the
            IMAGE functionality may be folded into an enhanced
            SUBMIT field.

         PASSWORD is the same as the TEXT attribute, except that
         text is not displayed as it is entered.

         RADIO is used for attributes that accept a single value
         from a set of alternatives. Each radio button field in
         the group should be given the same name. Only the
         selected radio button in the group generates a
         name/value pair in the submitted data. Radio buttons
         require an explicit VALUE attribute.

         RESET is a button that when pressed resets the form's
         fields to their specified initial values. The label to
         be displayed on the button may be specified just as for
         the SUBMIT button.

         SUBMIT is a button that when pressed submits the form.
         You can use the VALUE attribute to provide a non-
         editable label to be displayed on the button.  The
         default label is application-specific.  If a SUBMIT
         button is pressed in order to submit the form, and that
         button has a NAME attribute specified, then that button
         contributes a name/value pair to the submitted data.
         Otherwise, a SUBMIT button makes no contribution to the
         submitted data.

         TEXT is used for a single line text entry fields. Use in
         conjunction with the SIZE and MAXLENGTH attributes. Use
         the Textarea element for text fields which can accept
         multiple lines.

      VALUE

         The initial displayed value of the field, if it displays
         a textual or numerical value; or the value to be
         returned when the field is selected, if it displays a
         Boolean value. This attribute is required for radio
         buttons.

      2.15.4 Option

         <OPTION>

         Level 2

         The Option element can only occur within a Select

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         element. It represents one choice, and can take these
         attributes:

         DISABLED

            Proposed.

         SELECTED

            Indicates that this option is initially selected.

         VALUE

            When present indicates the value to be returned if this
            option is chosen. The returned value defaults to the
            contents of the Option element.

            The contents of the Option element is presented to the
            user to represent the option. It is used as a returned
            value if the VALUE attribute is not present.

      2.15.5 Select

         <SELECT NAME=... > ... </SELECT>

         Level 2

         The Select element allows the user to chose one of a set
         of alternatives described by textual labels. Every
         alternative is represented by the Option element.

         Attributes are:

         ERROR

            Proposed.

         MULTIPLE

            The MULTIPLE attribute is needed when users are allowed
            to make several selections, e.g. <SELECT MULTIPLE>.

         NAME

            Specifies the name that will submitted as a name/value
            pair.

         SIZE

            Specifies the number of visible items. If this is

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            greater than one, then the resulting form control will
            be a list.

         The Select element is typically rendered as a pull down
         or pop-up list. For example:

         <SELECT NAME="flavor">
         <OPTION>Vanilla
         <OPTION>Strawberry
         <OPTION>Rum and Raisin
         <OPTION>Peach and Orange
         </SELECT>

         If no option is initially marked as selected, then the
         first item listed is selected.

      2.15.6 Text Area

         <TEXTAREA> ... </TEXTAREA>

         Level 2

         The Textarea element lets users enter more than one line
         of text. For example:

         <TEXTAREA NAME="address" ROWS=64 COLS=6>
         HaL Computer Systems
         1315 Dell Avenue
         Campbell, California 95008
         </TEXTAREA>

         The text up to the end tag (</TEXTAREA>) is used to
         initialize the field's value. This end tag is always
         required even if the field is initially blank. When
         submitting a form, the line terminators are
         implementation dependent.

         In a typical rendering, the ROWS and COLS attributes
         determine the visible dimension of the field in
         characters. The field is rendered in a fixed-width font.
         HTML user agents should allow text to extend beyond
         these limits by scrolling as needed.

         NOTE: In the initial design for forms, multi-line text
         fields were supported by the Input element with
         TYPE=TEXT. Unfortunately, this causes problems for
         fields with long text values. SGML's default (Reference
         Quantity Set) limits the length of attribute literals to
         only 240 characters. The HTML 2.0 SGML declaration
         increases the limit to 1024 characters.

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   2.16 Character Data

      Level 0

      The characters between HTML tags represent text encoded
      according to ISO 8859/1 8-bit single-byte coded graphic
      character set known as Latin Alphabet No. 1, or simply
      Latin-1. There are 256 character positions in the Latin-
      1 encoding. Latin-1 includes characters from most
      Western European languages. It consists of the space
      character, 186 characters that form a subset of the
      graphic characters in ISO 6937/2 (1983), and four
      additional characters that are intended for inclusion in
      ISO 6937/2. Also see Section 2.4.

      The lower 128 character positions include a space, 33
      control characters, the 26 upper- and lowercase letters
      of the english alphabet, 10 numerals and 32 other
      printing characters This subset, functionally identical
      to ASCII, is defined by ISO 646 7-bit coded character
      set for information interchange, also known as the
      International Reference Version. ISO 646 is identical in
      most respect to the ANSI standard for ASCII (American
      Standard Code for Information Interchange). The only
      significant difference between ISO 646 and ASCII is the
      specific names assigned to the control characters in
      positions 00-31 and 127.

      The upper 128 positions include a non-breaking space, a
      soft hyphen indicator, 93 graphical characters, 8
      unassigned characters, and 25 control characters.
      Because non-breaking space and soft hyphen indicator are
      not recognized and interpreted by all HTML user agents,
      their use is discouraged.

      There are 58 character positions occupied by control
      characters. See Section 2.16.2 for details on the
      interpretation of control characters.

      Because certain special characters are subject to
      interpretation and special processing, information
      providers and HTML user agent implementors should follow
      the guidelines in Section 2.16.1.

      Certain characters may not be accessible from your
      keyboard, or some part of your system (i.e. translation
      software) may not be equipped to deal with 8-bit
      character codes. HTML and many HTML user agents provide
      character entity references (see Section 2.17.2) and

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      numerical character references (see Section 2.17.3) to
      facilitate the entry and interpretation of characters by
      name and by numerical position.

      Because certain characters will be interpreted as
      markup, they must be represented by markup as described
      in Section 2.16.3 and Section 2.16.4.

      2.16.1 Special Characters

         Certain characters have special meaning in HTML
         documents. There are two printing characters which may
         be interpreted by an HTML application to have an effect
         of the format of the text:

         Space

         -  Interpreted as a word space (place where a line can
            be broken) in all contexts except the Preformatted Text
            element.

         -  Interpreted as a nonbreaking space within the
            Preformatted Text element.

         Hyphen

         -  Interpreted as a hyphen glyph in all contexts

         -  Interpreted as a potential word space by
            hyphenation engine

      2.16.2 Control Characters

         Control characters are non-printable characters that are
         typically used for communication and device control, as
         format effectors, and as information separators.

         In SGML applications, the use of control characters is
         limited in order to maximize the chance of successful
         interchange over heterogenous networks and operating
         systems. In HTML, only three control characters are
         used. The valid control characters and their
         interpretation are:

         Horizontal Tab (HT - 9 dec)

         -  Interpreted as a word space in all contexts except
            preformatted text.

         -  Within preformatted text, the tab should be

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            interpreted to shift the horizontal column position to
            the next position which is a multiple of 8 on the same
            line; that is, col := (col+8) mod 8

         Line Feed (LF - 10 dec)

         -  Interpreted as a word space in all contexts except
            preformatted text.

         -  Within the Preformatted Text element, the tab
            should be interpreted as a shift to the start of a new
            line; that is, col := 0; row := row+1

         Carriage Return (CR - 13 dec)

         -  Interpreted as a word space in all contexts.

      2.16.3 Numeric Character References

         Any printing character within the 8-bit character
         encoding of ISO 8859/1 (256 character positions) or the
         7-bit character encoding of ISO 646 (128 character
         positions) may be represented within the text of an HTML
         document by a numeric character reference. See Section
         2.17.1 for a list of the characters, their names and
         input syntax.

         Two reasons for using a numeric character reference:

         -  the keyboard does not provide a key for the
            character, such as on U.S. keyboards which do not
            provide European characters

         -  the character may be interpreted as SGML coding,
            such as the ampersand (&), double quotes ("), the lesser
            (<) and greater (>) characters

         Numeric character references are represented in an HTML
         document as SGML entities whose name is number sign (#)
         followed by a numeral from 32-126 and 161-255. The HTML
         DTD includes a numeric character for each of the
         printing characters in Latin-1, so that one may
         reference them by number if it is inconvenient to enter
         them directly:

         the ampersand (&#38;), double quotes (&#34;),
         lesser (&#60;) and greater (&#62;) characters

      2.16.4 Character Entities


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         Many of the Latin alphabet No. 1 set of printing
         characters may be represented within the text of an HTML
         document by a character entity. See 2.17.2 for a list of
         the characters, names, input syntax, and descriptions.
         See 5.2.1 for the SGML entity definitions of "Added
         Latin 1 for HTML".

         Two reasons for using a character entity:

         -  the keyboard does not provide a key for the
            character, such as on U.S. keyboards which do not
            provide European characters
      
         -  the character may be interpreted as SGML coding,
            such as the ampersand (&), double quotes ("), the lesser
            (<) and greater (>) characters

         A character entity is represented in an HTML document as
         an SGML entity whose name is defined in the HTML DTD.
         The HTML DTD includes a character entity for each of the
         SGML markup characters and for each of the printing
         characters in the upper half of Latin-1, so that one may
         reference them by name if it is inconvenient to enter
         them directly:

         the ampersand (&amp;), double quotes (&quot;),
         lesser (&lt;) and greater (&gt;) characters

         Kurt G&ouml;del was a famous logician and mathematician.

         NOTE: To ensure that a string of characters is not
         interpreted as markup, represent all occurrences of <,
         >, and & by character or entity references.

         NOTE: There are SGML features, CDATA and RCDATA, to
         allow most <, >, and & characters to be entered without
         the use of entity or character references. Because these
         features tend to be used and implemented inconsistently,
         and because they require 8-bit characters to represent
         non-ASCII characters, they are not used in this version
         of the HTML DTD. An earlier HTML specification included
         an Example element (<XMP>) whose syntax is not
         expressible in SGML. No markup was recognized inside of
         the Example element except the </XMP> end tag. While
         HTML user agents are encouraged to support this idiom,
         its use is deprecated.

   2.17 Character Entity Sets

      The following entity names are used in HTML, always

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      prefixed by ampersand (&) and followed by a semicolon as
      shown.

      They represent particular graphic characters which have
      special meanings in places in the markup, or may not be
      part of the character set available to the writer.

      2.17.1 Numeric and Special Graphic Entities

         The following table lists each of the supported
         characters specified in the Numeric and Special Graphic
         entity set, along with its name, syntax for use, and
         description. This list is derived from ISO Standard
         8879:1986//ENTITIES Numeric and Special Graphic//EN
         however HTML does not provide support for the entire
         entity set. Only the entities listed below are
         supported.

         GLYPH   NAME            SYNTAX      DESCRIPTION
         <       lt              &lt;        Less than sign
         >       gt              &gt;        Greater than sign
         &       amp             &amp;       Ampersand
         "       quot            &quot;      Double quote sign

      2.17.2 ISO Latin 1 Character Entities

         The following table lists each of the characters
         specified in the Added Latin 1 entity set, along with
         its name, syntax for use, and description. This list is
         derived from ISO Standard 8879:1986//ENTITIES Added
         Latin 1//EN. HTML supports the entire entity set.

         NAME            SYNTAX      DESCRIPTION

         Aacute          &Aacute;    Capital A, acute accent
         Agrave          &Agrave;    Capital A, grave accent
         Acirc           &Acirc;     Capital A, circumflex accent
         Atilde          &Atilde;    Capital A, tilde
         Aring           &Aring;     Capital A, ring
         Auml            &Auml;      Capital A, dieresis or umlaut mark
         AElig           &AElig;     Capital AE dipthong (ligature)
         Ccedil          &Ccedil;    Capital C, cedilla
         Eacute          &Eacute;    Capital E, acute accent
         Egrave          &Egrave;    Capital E, grave accent
         Ecirc           &Ecirc;     Capital E, circumflex accent
         Euml            &Euml;      Capital E, dieresis or umlaut mark
         Iacute          &Iacute;    Capital I, acute accent
         Igrave          &Igrave;    Capital I, grave accent
         Icirc           &Icirc;     Capital I, circumflex accent
         Iuml            &Iuml;      Capital I, dieresis or umlaut mark

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         ETH             &ETH;       Capital Eth, Icelandic
         Ntilde          &Ntilde;    Capital N, tilde
         Oacute          &Oacute;    Capital O, acute accent
         Ograve          &Ograve;    Capital O, grave accent
         Ocirc           &Ocirc;     Capital O, circumflex accent
         Otilde          &Otilde;    Capital O, tilde
         Ouml            &Ouml;      Capital O, dieresis or umlaut mark
         Oslash          &Oslash;    Capital O, slash
         Uacute          &Uacute;    Capital U, acute accent
         Ugrave          &Ugrave;    Capital U, grave accent
         Ucirc           &Ucirc;     Capital U, circumflex accent
         Uuml            &Uuml;      Capital U, dieresis or umlaut mark
         Yacute          &Yacute;    Capital Y, acute accent

         THORN           &THORN;     Capital THORN, Icelandic
         szlig           &szlig;     Small sharp s, German (sz ligature)

         aacute          &aacute;    Small a, acute accent
         agrave          &agrave;    Small a, grave accent
         acirc           &acirc;     Small a, circumflex accent
         atilde          &atilde;    Small a, tilde
         auml            &auml;      Small a, dieresis or umlaut mark
         aelig           &aelig;     Small ae dipthong (ligature)
         ccedil          &ccedil;    Small c, cedilla
         eacute          &eacute;    Small e, acute accent
         egrave          &egrave;    Small e, grave accent
         ecirc           &ecirc;     Small e, circumflex accent
         euml            &euml;      Small e, dieresis or umlaut mark
         iacute          &iacute;    Small i, acute accent
         igrave          &igrave;    Small i, grave accent
         icirc           &icirc;     Small i, circumflex accent
         iuml            &iuml;      Small i, dieresis or umlaut mark
         eth             &eth;       Small eth, Icelandic
         ntilde          &ntilde;    Small n, tilde
         oacute          &oacute;    Small o, acute accent
         ograve          &ograve;    Small o, grave accent
         ocirc           &ocirc;     Small o, circumflex accent
         otilde          &otilde;    Small o, tilde
         ouml            &ouml;      Small o, dieresis or umlaut mark
         oslash          &oslash;    Small o, slash
         uacute          &uacute;    Small u, acute accent
         ugrave          &ugrave;    Small u, grave accent
         ucirc           &ucirc;     Small u, circumflex accent
         uuml            &uuml;      Small u, dieresis or umlaut mark
         yacute          &yacute;    Small y, acute accent
         thorn           &thorn;     Small thorn, Icelandic
         yuml            &yuml;      Small y, dieresis or umlaut mark

      2.17.3 Numerical Character References


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         This list, sorted numerically, is derived from ISO
         8859/1 8-bit single-byte coded graphic character set:

         REFERENCE           DESCRIPTION

         &#00; - &#08;       Unused
         &#09;               Horizontal tab
         &#10;               Line feed
         &#11; - &#31;       Unused

         &#32;               Space
         &#33;               Exclamation mark
         &#34;               Quotation mark
         &#35;               Number sign
         &#36;               Dollar sign
         &#37;               Percent sign
         &#38;               Ampersand
         &#39;               Apostrophe
         &#40;               Left parenthesis
         &#41;               Right parenthesis
         &#42;               Asterisk
         &#43;               Plus sign
         &#44;               Comma
         &#45;               Hyphen
         &#46;               Period (fullstop)
         &#47;               Solidus (slash)

         &#48; - &#57;       Digits 0-9

         &#58;               Colon
         &#59;               Semi-colon
         &#60;               Less than
         &#61;               Equals aign
         &#62;               Greater than
         &#63;               Question mark
         &#64;               Commercial at

         &#65; - &#90;       Letters A-Z

         &#91;               Left square bracket
         &#92;               Reverse solidus (backslash)
         &#93;               Right square bracket
         &#95;               Horizontal bar
         &#96;               Acute accent

         &#97; - &#122;      Letters a-z

         &#123;              Left curly brace
         &#124;              Vertical bar
         &#125;              Right curly brace

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         &#126;              Tilde

         &#127; - &#160;     Unused

         &#161;              Inverted exclamation
         &#162;              Cent sign
         &#163;              Pound sterling
         &#164;              General currency sign
         &#165;              Yen sign
         &#166;              Broken vertical bar
         &#167;              Section sign
         &#168;              Umlaut (dieresis)
         &#169;              Copyright
         &#170;              Feminine ordinal
         &#171;              Left angle quote, guillemotleft
         &#172;              Not sign
         &#173;              Soft hyphen
         &#174;              Registered trademark
         &#175;              Macron accent
         &#176;              Degree sign
         &#177;              Plus or minus
         &#178;              Superscript two
         &#179;              Superscript three
         &#180;              Acute accent
         &#181;              Micro sign
         &#182;              Paragraph sign
         &#183;              Middle dot
         &#184;              Cedilla
         &#185;              Superscript one
         &#186;              Masculine ordinal
         &#187;              Right angle quote, guillemotright
         &#188;              Fraction one-fourth
         &#189;              Fraction one-half
         &#190;              Fraction three-fourths
         &#191;              Inverted question mark

         &#192;              Capital A, acute accent
         &#193;              Capital A, grave accent
         &#194;              Capital A, circumflex accent
         &#195;              Capital A, tilde
         &#196;              Capital A, ring
         &#197;              Capital A, dieresis or umlaut mark
         &#198;              Capital AE dipthong (ligature)
         &#199;              Capital C, cedilla
         &#200;              Capital E, acute accent
         &#201;              Capital E, grave accent
         &#202;              Capital E, circumflex accent
         &#203;              Capital E, dieresis or umlaut mark
         &#204;              Capital I, acute accent
         &#205;              Capital I, grave accent

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         &#206;              Capital I, circumflex accent
         &#207;              Capital I, dieresis or umlaut mark
         &#208;              Capital Eth, Icelandic
         &#209;              Capital N, tilde
         &#210;              Capital O, acute accent
         &#211;              Capital O, grave accent
         &#212;              Capital O, circumflex accent
         &#213;              Capital O, tilde
         &#214;              Capital O, dieresis or umlaut mark

         &#215;              Multiply sign

         &#216;              Capital O, slash
         &#217;              Capital U, acute accent
         &#218;              Capital U, grave accent
         &#219;              Capital U, circumflex accent
         &#220;              Capital U, dieresis or umlaut mark
         &#221;              Capital Y, acute accent

         &#222;              Capital THORN, Icelandic
         &#223;              Small sharp s, German (sz ligature)

         &#224;              Small a, acute accent
         &#225;              Small a, grave accent
         &#226;              Small a, circumflex accent
         &#227;              Small a, tilde
         &#228;              Small a, tilde
         &#229;              Small a, dieresis or umlaut mark
         &#230;              Small ae dipthong (ligature)
         &#231;              Small c, cedilla
         &#232;              Small e, acute accent
         &#233;              Small e, grave accent
         &#234;              Small e, circumflex accent
         &#235;              Small e, dieresis or umlaut mark
         &#236;              Small i, acute accent
         &#237;              Small i, grave accent
         &#238;              Small i, circumflex accent
         &#239;              Small i, dieresis or umlaut mark
         &#240;              Small eth, Icelandic
         &#241;              Small n, tilde
         &#242;              Small o, acute accent
         &#243;              Small o, grave accent
         &#244;              Small o, circumflex accent
         &#245;              Small o, tilde
         &#246;              Small o, dieresis or umlaut mark

         &#247;              Division sign

         &#248;              Small o, slash
         &#249;              Small u, acute accent

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         &#250;              Small u, grave accent
         &#251;              Small u, circumflex accent
         &#252;              Small u, dieresis or umlaut mark
         &#253;              Small y, acute accent
         &#254;              Small thorn, Icelandic
         &#255;              Small y, dieresis or umlaut mark

3. Security Considerations

   Anchors, embedded images, and all other elements which
   contain URIs as parameters may cause the URI to be
   dereferenced in response to user input. In this case,
   the security considerations of the URI specification
   apply.

   Documents may be constructed whose visible contents
   mislead the reader to follow a link to unsuitable or
   offensive material.

4. Obsolete and Proposed Features

   4.1 Obsolete Features

   This section describes elements that are no longer part
   of HTML. Client implementors should implement these
   obsolete elements for compatibility with previous
   versions of the HTML specification.

      4.1.1 Comment

         The Comment element is used to delimit unneeded text and
         comments. The Comment element has been introduced in
         some HTML applications but should be replaced by the
         SGML comment feature in new HTML user agents (see
         Section 2.6.5).

      4.1.2 Highlighted Phrase

         The Highlighted Phrase element (<HP>) should be ignored
         if not implemented. This element has been replaced by
         more meaningful elements (see Section 2.9).

         Example of use:

         <HP1>first highlighted phrase</HP1>non

         highlighted text<HP2>second highlighted
         phrase</HP2> etc.

       4.1.3 Plain Text

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         <PLAINTEXT>

         The Plain Text element is used to terminates the HTML
         entity and to indicate that what follows is not SGML
         which does not require parsing. Instead, an old HTTP
         convention specified that what followed was an ASCII
         (MIME "text/plain") body. Its presence is an
         optimization. There is no closing tag.

         Example of use:

         <PLAINTEXT>
         0001 This is line one of a long listing
         0002 file from <ANY@HOST.INC.COM> which is sent

      4.1.4 Example and Listing

         <XMP> ... </XMP> and <LISTING> ... </LISTING>

         The Example element and Listing element have been
         replaced by the Preformatted Text element.

         These styles allow text of fixed-width characters to be
         embedded absolutely as is into the document. The syntax
         is:

         <LISTING>
         ...
         </LISTING>

         or

         <XMP>
         ...
         </XMP>

         The text between these tags is typically rendered in a
         monospaced font so that any formatting done by character
         spacing on successive lines will be maintained.

         Between the opening and closing tags:

         -  The text may contain any ISO Latin-1 printable
            characters, expect for the end tag opener. The Example
            and Listing elements have historically used
            specifications which do not conform to SGML.
            Specifically, the text may contain ISO Latin printable
            characters, including the tag opener, as long it they
            does not contain the closing tag in full.

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         -  SGML does not support this form. HTML user agents
            may vary on how they interpret other tags within Example
            and Listing elements.

         -  Line boundaries within the text are rendered as a
            move to the beginning of the next line, except for one
            immediately following a start tag or immediately
            preceding an end tag.

         -  The ASCII horizontal tab character must be
            interpreted as the smallest positive nonzero number of
            spaces which will leave the number of characters so far
            on the line as a multiple of 8. Its use is not
            recommended.

      The Listing element is rendered so that at least 132
      characters fit on a line. The Example element is
      rendered to that at least 80 characters fit on a line
      but is otherwise identical to the Listing element.

   4.2 Proposed Features

      This section describes proposed HTML elements and
      entities that are not currently supported under HTML
      Levels 0, 1, or 2, but may be supported in the future.

      4.2.1 Defining Instance

         <DFN> ... </DFN>

         The Defining Instance element indicates the defining
         instance of a term. The typical rendering is bold or
         bold italic. This element is not widely supported.

      4.2.2 Special Characters

         To indicate special characters, HTML uses entity or
         numeric representations. Two additional character
         presentations are proposed:

         CHARACTER                  REPRESENTATION

         Non-breaking space         &nbsp;
         Soft-hyphen                &shy;
         Registered                 &reg;
         Copyright                  &copy;

      4.2.3 Strike


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         <STRIKE> ... </STRIKE>

         The Strike element is proposed to indicate
         strikethrough, a font style in which a horizontal line
         appears through characters. This element is not widely
         supported.

      4.2.4 Underline

         <U> ... </U>

         The Underline element is proposed to indicate that the
         text should be rendered as underlined. This proposed tag
         is not supported by all HTML user agents.

         Example of use:

         The text <U>shown here</U> is rendered in the document
         as underlined.

5. HTML Document Type Definitions

   5.1 SGML Declaration for HTML

This is the SGML Declaration for HyperText Markup Language
(HTML) as used by the World Wide Web (WWW) application:

<!SGML  "ISO 8879:1986"
--
        SGML Declaration for HyperText Markup Language (HTML).

--

CHARSET
         BASESET  "ISO 646:1983//CHARSET
                   International Reference Version (IRV)//ESC 2/5 4/0"
         DESCSET  0   9   UNUSED
                  9   2   9
                  11  2   UNUSED
                  13  1   13
                  14  18  UNUSED
                  32  95  32
                  127 1   UNUSED
     BASESET "ISO Registration Number 100//CHARSET
              ECMA-94 Right Part of Latin Alphabet Nr. 1//ESC 2/13 4/1"
     DESCSET   128 32 UNUSED
               160 96 32

CAPACITY        SGMLREF
                TOTALCAP        150000

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                GRPCAP          150000

SCOPE    DOCUMENT
SYNTAX
         SHUNCHAR CONTROLS 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
                           18 19 20 21 22 23 24 25 26 27 28 29 30 31 127
         BASESET  "ISO 646:1983//CHARSET
                   International Reference Version (IRV)//ESC 2/5 4/0"
         DESCSET  0 128 0
         FUNCTION
              --  SPACE       32
                  TAB SEPCHAR  9
                  LF  SEPCHAR 10
                  FF  SEPCHAR 12
                  CR  SEPCHAR 13 --

    -- The above is an accurate description of the usage of FUNCTION --
    -- characters in HTML implementations; that is, there is no      --
    -- Record Start or Record End character, and no occurences of    --
    -- character 10 or 13 are "ignored" by the parser.               --
    -- But because few SGML implementations support this concrete    --
    -- sytax, we include the one below.                              --

    -- Note that in order to get correct behaviour w.r.t. newline    --
    -- processing, you will have to play some tricks in construcing  --
    -- the document entity for parsing in order to keep the parser   --
    -- from ignoring newlines in surprising ways                     --

                  RE          13
                  RS          10
                  SPACE       32
                  TAB SEPCHAR  9


         NAMING   LCNMSTRT ""
                  UCNMSTRT ""
                  LCNMCHAR ".-"
                  UCNMCHAR ".-"
                  NAMECASE GENERAL YES
                           ENTITY  NO
         DELIM    GENERAL  SGMLREF
                  SHORTREF SGMLREF
         NAMES    SGMLREF
         QUANTITY SGMLREF
                  NAMELEN  72    -- somewhat arbitrary; taken from
                                    internet line length conventions --
                  TAGLVL   100
                  LITLEN   1024
                  GRPGTCNT 150
                  GRPCNT   64

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FEATURES
  MINIMIZE
    DATATAG  NO
    OMITTAG  YES
    RANK     NO
    SHORTTAG YES
  LINK
    SIMPLE   NO
    IMPLICIT NO
    EXPLICIT NO
  OTHER
    CONCUR   NO
    SUBDOC   NO
    FORMAL   YES
  APPINFO    NONE
>
<!--
        $Id: html.decl,v 1.9 1994/11/15 19:54:44 connolly Exp $

        Author: Daniel W. Connolly <connolly@hal.com>

        See also: http://www.hal.com/%7Econnolly/html-spec
                  http://info.cern.ch/hypertext/WWW/MarkUp/MarkUp.html
 -->

   5.1.1 Sample SGML Open Style Entity Catalog for HTML

      The SGML standard describes an "entity manager" as the
      portion or component of an SGML system that maps SGML
      entities into the actual storage model (e.g., the file
      system).  The standard itself does not define a particular
      mapping methodology or notation.

      To assist the interoperability among various SGML tools and
      systems, the SGML Open consortium has passed a technical
      resolution that defines a format for an
      application-independent entity catalog that maps external
      identifiers and/or entity names to file names.

      Each entry in the catalog associates a storage object
      identifier (such as a file name) with information about the
      external entity that appears in the SGML document.  In
      addition to entries that associate public identifiers, a
      catalog entry can associate an entity name with a storage
      object indentifier.  For example, the following are
      possible catalog entries:

PUBLIC "ISO 8879:1986//ENTITIES Added Latin 1//EN" "iso-lat1.gml"
PUBLIC "-//ACME DTD Writers//DTD General Report//EN" report.dtd

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ENTITY "graph1" "graphics\graph1.cgm"
In particular, the following shows entries relevant to HTML.
        -- catalog: SGML Open style entity catalog for HTML --
        -- $Id: catalog,v 1.1 1994/10/07 21:35:07 connolly Exp $ --

        -- Ways to refer to Level 2: most general to most specific --
PUBLIC  "-//IETF//DTD HTML//EN"                 html.dtd
PUBLIC  "-//IETF//DTD HTML//EN//2.0"            html.dtd
PUBLIC  "-//IETF//DTD HTML Level 2//EN"         html.dtd
PUBLIC  "-//IETF//DTD HTML Level 2//EN//2.0"    html.dtd

        -- Ways to refer to Level 1: most general to most specific --
PUBLIC  "-//IETF//DTD HTML Level 1//EN"         html-1.dtd
PUBLIC  "-//IETF//DTD HTML Level 1//EN//2.0"    html-1.dtd

        -- Ways to refer to Level 0: most general to most specific --
PUBLIC  "-//IETF//DTD HTML Level 0//EN"         html-0.dtd
PUBLIC  "-//IETF//DTD HTML Level 0//EN//2.0"    html-0.dtd

        -- ISO latin 1 entity set for HTML --
PUBLIC  "-//IETF//ENTITIES Added Latin 1//EN"   ISOlat1.sgml

   5.2 HTML DTD

   This is the Document Type Definition for the
   HyperText Markup Language (HTML DTD):

<!--    html.dtd

        Document Type Definition for the
                HyperText Markup Language (HTML DTD)

        $Id: html.dtd,v 1.21 1994/11/15 19:54:38 connolly Exp $

        Author: Daniel W. Connolly <connolly@hal.com>
        See Also: html.decl, html-0.dtd, html-1.dtd
                  http://www.hal.com/%7Econnolly/html-spec/index.html
                  http://info.cern.ch/hypertext/WWW/MarkUp2/MarkUp.html
-->

<!ENTITY % HTML.Version
        "-//IETF//DTD HTML//EN//2.0"

        -- Typical usage:

            <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
            <html>
            ...
            </html>
        --

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        >


<!--================== Feature Test Entities ======================-->

<!ENTITY % HTML.Recommended "IGNORE"
    -- Certain features of the language are necessary for compatibility
       with widespread usage, but they may compromise the structural
       integrity of a document. This feature test entity enables
       a more prescriptive document type definition that eliminates
       those features.
    -->

<![ %HTML.Recommended [
        <!ENTITY % HTML.Deprecated "IGNORE">
]]>

<!ENTITY % HTML.Deprecated "INCLUDE"
    -- Certain features of the language are necessary for compatibility
       with earlier versions of the specification, but they tend
       to be used an implemented inconsistently, and their use is
       deprecated. This feature test entity enables a document type
       definition that eliminates these features.
    -->

<!ENTITY % HTML.Highlighting "INCLUDE"
        -- Use this feature test entity to validate that a document
           uses no highlighting tags, which may be ignored on minimal
           implementations.
        -->

<!ENTITY % HTML.Forms "INCLUDE"
        -- Use this feature test entity to validate that a document
           contains no forms, which may not be supported in minimal
           implementations
        -->

<!--================== Imported Names =============================-->

<!ENTITY % Content-Type "CDATA"
        -- meaning an internet media type
           (aka MIME content type, as per RFC1521)
        -->

<!ENTITY % HTTP-Method "GET | POST"
        -- as per HTTP specification, in progress
        -->

<!ENTITY % URI "CDATA"
 -- The term URI means a CDATA attribute

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    whose value is a Uniform Resource Identifier,
    as defined by
 "Universal Resource Identifiers" by Tim Berners-Lee
 aka http://info.cern.ch/hypertext/WWW/Addressing/URL/URI_Overview.html
 aka RFC 1630

 Note that CDATA attributes are limited by the LITLEN
 capacity (1024 in the current version of html.decl),
 so that URIs in HTML have a bounded length.

 -->


<!--================== DTD "Macros" ===============================-->

<!ENTITY % heading "H1|H2|H3|H4|H5|H6">

<!ENTITY % list " UL | OL | DIR | MENU " >


<!--================ Character mnemonic entities ==================-->

<!ENTITY % ISOlat1 PUBLIC
  "-//IETF//ENTITIES Added Latin 1 for HTML//EN">
%ISOlat1;

<!ENTITY amp CDATA "&#38;"     -- ampersand          -->
<!ENTITY gt CDATA "&#62;"      -- greater than       -->
<!ENTITY lt CDATA "&#60;"      -- less than          -->
<!ENTITY quot CDATA "&#34;"    -- double quote       -->


<!--=================== Text Markup ===============================-->

<![ %HTML.Highlighting [

<!ENTITY % font " TT | B | I ">

<!ENTITY % phrase "EM | STRONG | CODE | SAMP | KBD | VAR | CITE ">

<!ENTITY % text "#PCDATA | A | IMG | BR | %phrase | %font">

<!ELEMENT (%font;|%phrase) - - (%text)+>
<!-- <TT>       Typewriter text                         -->
<!-- <B>        Bold text                               -->
<!-- <I>        Italic text                             -->

<!-- <EM>       Emphasized phrase                       -->
<!-- <STRONG>   Strong emphais                          -->
<!-- <CODE>     Source code phrase                      -->

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<!-- <SAMP>     Sample text or characters               -->
<!-- <KBD>      Keyboard phrase, e.g. user input        -->
<!-- <VAR>      Variable phrase or substituable         -->
<!-- <CITE>     Name or title of cited work             -->

<!ENTITY % pre.content "#PCDATA | A | HR | BR | %font | %phrase">

]]>

<!ENTITY % text "#PCDATA | A | IMG | BR">

<!ELEMENT BR    - O EMPTY>
<!-- <BR>       Line break      -->


<!--================== Link Markup ================================-->

<![ %HTML.Recommended [
        <!ENTITY % linkName "ID">
]]>

<!ENTITY % linkName "CDATA">

<!ENTITY % linkType "NAME"
        -- a list of these will be specified at a later date -->

<!ENTITY % linkExtraAttributes
        "REL %linkType #IMPLIED
        REV %linkType #IMPLIED
        URN CDATA #IMPLIED
        TITLE CDATA #IMPLIED
        METHODS NAMES #IMPLIED
        ">

<![ %HTML.Recommended [
        <!ENTITY % A.content   "(%text)+"
        -- <H1><a name="xxx">Heading</a></H1>
                is preferred to
           <a name="xxx"><H1>Heading</H1></a>
        -->
]]>

<!ENTITY % A.content   "(%heading|%text)+">

<!ELEMENT A     - - %A.content -(A)>
<!ATTLIST A
        HREF %URI #IMPLIED
        NAME %linkName #IMPLIED
        %linkExtraAttributes;
        >

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<!-- <A>                Anchor; source and/or destination of a link -->
<!-- <A NAME="...">     Name of this anchor                         -->
<!-- <A HREF="...">     Address of link destination                 -->
<!-- <A URN="...">      Permanent address of destination            -->
<!-- <A REL=...>        Relationship of this anchor to destination  -->
<!-- <A REV=...>        Relationship of destination to this anchor  -->
<!-- <A TITLE="...">    Title of destination (advisory)
                -->
<!-- <A METHODS="...">  Operations allowed on destination
(advisory)      -->


<!--=================== Images ====================================-->

<!ELEMENT IMG    - O EMPTY>
<!ATTLIST IMG
        SRC %URI;  #REQUIRED
        ALT CDATA #IMPLIED
        ALIGN (top|middle|bottom) #IMPLIED
        ISMAP (ISMAP) #IMPLIED
        >

<!-- <IMG>              Image; icon, glyph or illustration      -->
<!-- <IMG SRC="...">    Address of image object                 -->
<!-- <IMG ALT="...">    Textual alternative                     -->
<!-- <IMG ALIGN=...>    Position relative to text               -->
<!-- <IMG ISMAP>        Each pixel can be a link                -->

<!--=================== Paragraphs=================================-->

<!ELEMENT P     - O (%text)+>
<!-- <P>        Paragraph       -->


<!--=================== Headings, Titles, Sections ================-->

<!ELEMENT HR    - O EMPTY>
<!-- <HR>       Horizontal rule -->

<!ELEMENT ( %heading )  - -  (%text;)+>
<!-- <H1>       Heading, level 1 -->
<!-- <H2>       Heading, level 2 -->
<!-- <H3>       Heading, level 3 -->
<!-- <H4>       Heading, level 4 -->
<!-- <H5>       Heading, level 5 -->
<!-- <H6>       Heading, level 6 -->


<!--=================== Text Flows ================================-->


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<![ %HTML.Forms [
        <!ENTITY % block.forms "| FORM | ISINDEX">
]]>

<!ENTITY % block.forms "">

<![ %HTML.Deprecated [
        <!ENTITY % preformatted "PRE | XMP | LISTING">
]]>

<!ENTITY % preformatted "PRE">

<!ENTITY % block "P | %list | DL
        | %preformatted
        | BLOCKQUOTE %block.forms">

<!ENTITY % flow "(%text|%block)*">

<!ENTITY % pre.content "#PCDATA | A | HR | BR">
<!ELEMENT PRE - - (%pre.content)+>
<!ATTLIST PRE
        WIDTH NUMBER #implied
        >

<!-- <PRE>              Preformatted text               -->
<!-- <PRE WIDTH=...>    Maximum characters per line     -->

<![ %HTML.Deprecated [

<!ENTITY % literal "CDATA"
        -- historical, non-conforming parsing mode where
           the only markup signal is the end tag
           in full
        -->

<!ELEMENT (XMP|LISTING) - -  %literal>
<!-- <XMP>              Example section         -->
<!-- <LISTING>          Computer listing        -->

<!ELEMENT PLAINTEXT - O %literal>
<!-- <PLAINTEXT>        Plain text passage      -->

]]>


<!--=================== Lists =====================================-->

<!ELEMENT DL    - -  (DT | DD)+>
<!ATTLIST DL
        COMPACT (COMPACT) #IMPLIED>

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<!ELEMENT DT    - O (%text)+>
<!ELEMENT DD    - O %flow>

<!-- <DL>               Definition list, or glossary    -->
<!-- <DL COMPACT>       Compact style list              -->
<!-- <DT>               Term in definition list         -->
<!-- <DD>               Definition of term              -->

<!ELEMENT (OL|UL) - -  (LI)+>
<!ELEMENT (DIR|MENU) - -  (LI)+ -(%block)>
<!ATTLIST (%list)
        COMPACT (COMPACT) #IMPLIED>
<!-- <UL>               Unordered list                  -->
<!-- <UL COMPACT>       Compact list style              -->
<!-- <OL>               Ordered, or numbered list       -->
<!-- <OL COMPACT>       Compact list style              -->
<!-- <DIR>              Directory list                  -->
<!-- <DIR COMPACT>      Compact list style              -->
<!-- <MENU>             Menu list                       -->
<!-- <MENU COMPACT>     Compact list style              -->

<!ELEMENT LI    - O %flow>

<!-- <LI>               List item                       -->

<!--=================== Document Body =============================-->

<![ %HTML.Recommended [
        <!ENTITY % body.content "(%heading|%block|HR|ADDRESS)*"
        -- <h1>Heading</h1>
           <p>Text ...
                is preferred to
           <h1>Heading</h1>
           Text ...
        -->
]]>

<!ENTITY % body.content "(%heading | %text | %block | HR | ADDRESS)*">

<!ELEMENT BODY O O  %body.content>
<!-- <BODY>     Document body   -->

<!ELEMENT BLOCKQUOTE - - %body.content>
<!-- <BLOCKQUOTE>       Quoted passage  -->

<!ELEMENT ADDRESS - - (%text|P)*>
<!-- <ADDRESS>  Address, signature, or byline for document or
passage -->


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<!--================ Forms =======================================-->

<![ %HTML.Forms [

<!ELEMENT FORM - - %body.content -(FORM) +(INPUT|SELECT|TEXTAREA)>
<!ATTLIST FORM
        ACTION %URI #IMPLIED
        METHOD (%HTTP-Method) GET
        ENCTYPE %Content-Type; "application/x-www-form-urlencoded"
        >

<!-- <FORM>                     Fill-out or data-entry form     -->
<!-- <FORM ACTION="...">        Address for completed form      -->
<!-- <FORM METHOD=...>          Method of submitting form       -->
<!-- <FORM ENCTYPE="...">       Representation of form data     -->

<!ENTITY % InputType "(TEXT | PASSWORD | CHECKBOX |
                        RADIO | SUBMIT | RESET |
                        IMAGE | HIDDEN )">
<!ELEMENT INPUT - O EMPTY>
<!ATTLIST INPUT
        TYPE %InputType TEXT
        NAME CDATA #IMPLIED
        VALUE CDATA #IMPLIED
        SRC %URI #IMPLIED
        CHECKED (CHECKED) #IMPLIED
        SIZE CDATA #IMPLIED
        MAXLENGTH NUMBER #IMPLIED
        ALIGN (top|middle|bottom) #IMPLIED
        >

<!-- <INPUT>                    Form input datum                -->
<!-- <INPUT TYPE=...>           Type of input interaction       -->
<!-- <INPUT TYPE=...>           Name of form datum              -->
<!-- <INPUT VALUE="...">        Default/initial/selected value  -->
<!-- <INPUT SRC="...">          Address of image                -->
<!-- <INPUT CHECKED>            Initial state is "on"           -->
<!-- <INPUT SIZE=...>           Field size hint                 -->
<!-- <INPUT MAXLENGTH=...>      Data length maximum             -->
<!-- <INPUT ALIGN=...>          Image
alignment                       -->

<!ELEMENT SELECT - - (OPTION+)>
<!ATTLIST SELECT
        NAME CDATA #REQUIRED
        SIZE NUMBER #IMPLIED
        MULTIPLE (MULTIPLE) #IMPLIED
        >


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<!-- <SELECT>                Selection of option(s)                -->
<!-- <SELECT NAME=...>       Name of form datum                    -->
<!-- <SELECT SIZE=...>       Number of options displayed at a time -->
<!-- <SELECT MULTIPLE>       Multiple selections allowed           -->

<!ELEMENT OPTION - O (#PCDATA)>
<!ATTLIST OPTION
        SELECTED (SELECTED) #IMPLIED
        VALUE CDATA #IMPLIED
        >

<!-- <OPTION>                   A selection option                  -->
<!-- <OPTION SELECTED>          Initial state                       -->
<!-- <OPTION VALUE="">          Form datum value for this option    -->

<!ELEMENT TEXTAREA - - (#PCDATA)>
<!ATTLIST TEXTAREA
        NAME CDATA #REQUIRED
        ROWS NUMBER #REQUIRED
        COLS NUMBER #REQUIRED
        >

<!-- <TEXTAREA>                 An area for text input          -->
<!-- <TEXTAREA NAME=...>        Name of form datum              -->
<!-- <TEXTAREA ROWS=...>        Height of area                  -->
<!-- <TEXTAREA COLS=...>        Width of area                   -->

]]>


<!--================ Document Head ================================-->

<!ENTITY % head.link "& LINK*">

<![ %HTML.Recommended [
        <!ENTITY % head.nextid "">
]]>
<!ENTITY % head.nextid "& NEXTID?">

<!ENTITY % head.content "TITLE & ISINDEX? & BASE? & META*
                         %head.nextid
                         %head.link">

<!ELEMENT HEAD O O  (%head.content)>
<!-- <HEAD>     Document head   -->

<!ELEMENT TITLE - -  (#PCDATA)>
<!-- <TITLE>    Title of document -->

<!ELEMENT LINK - O EMPTY>

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<!ATTLIST LINK
        HREF %URI #REQUIRED
        %linkExtraAttributes; >
<!-- <LINK>             Link from this document                     -->
<!-- <LINK HREF="...">  Address of link destination                 -->
<!-- <LINK URN="...">   Lasting name of destination                 -->
<!-- <LINK REL=...>     Relationship of this document to dest       -->
<!-- <LINK REV=...>     Relationship of destination to document     -->
<!-- <LINK TITLE="..."> Title of destination (advisory)             -->
<!-- <LINK METHODS="..."> Operations allowed on dest (advisory)     -->

<!ELEMENT ISINDEX - O EMPTY>
<!-- <ISINDEX>          Document is a searchable index          -->

<!ELEMENT BASE - O EMPTY>
<!ATTLIST BASE
        HREF %URI; #REQUIRED
        >
<!-- <BASE>             Base context document                   -->
<!-- <BASE HREF="...">  Address for this document               -->

<!ELEMENT NEXTID - O EMPTY>
<!ATTLIST NEXTID N %linkName #REQUIRED>
<!-- <NEXTID>           Next ID to use for link name            -->
<!--
<NEXTID N=...>  Next ID to use for link name                    -->

<!ELEMENT META - O EMPTY>
<!ATTLIST META
        HTTP-EQUIV  NAME    #IMPLIED
        NAME        NAME    #IMPLIED
        CONTENT     CDATA   #REQUIRED
        >
<!-- <META>                     Generic Metainformation         -->
<!-- <META HTTP-EQUIV=...>      HTTP response header name       -->
<!-- <META HTTP-EQUIV=...>      Metainformation name            -->
<!-- <META CONTENT="...">       Associated information          -->

<!--================ Document Structure ===========================-->

<![ %HTML.Deprecated [
        <!ENTITY % html.content "HEAD, BODY, PLAINTEXT?">
]]>
<!ENTITY % html.content "HEAD, BODY">

<!ELEMENT HTML O O  (%html.content)>
<!ENTITY % version.attr "VERSION CDATA #FIXED &#34;%HTML.Version;&#34;">

<!ATTLIST HTML
        %version.attr;

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                                HTML 2.0             November 28, 1994


        >

<!-- <HTML>             HyperText Markup Language Document      -->
<!-- <HTML
VERSION="...">  Version of HTML specification           -->

5.2.1 ISO Latin 1 Definitions for HTML

<!-- (C) International Organization for Standardization 1986
     Permission to copy in any form is granted for use with
     conforming SGML systems and applications as defined in
     ISO 8879:1986, provided this notice is included in all copies.
-->
<!-- Character entity set. Typical invocation:
     <!ENTITY % ISOlat1 PUBLIC
       "-//IETF//ENTITIES Added Latin 1 for HTML//EN">
     %ISOlat1;
-->
<!-- Modified for use in HTML
   $Id: ISOlat1.sgml,v 1.1 1994/09/24 14:06:34 connolly Exp $ -->
<!ENTITY AElig  CDATA "&#198;" -- capital AE diphthong (ligature) -->
<!ENTITY Aacute CDATA "&#193;" -- capital A, acute accent -->
<!ENTITY Acirc  CDATA "&#194;" -- capital A, circumflex accent -->
<!ENTITY Agrave CDATA "&#192;" -- capital A, grave accent -->
<!ENTITY Aring  CDATA "&#197;" -- capital A, ring -->
<!ENTITY Atilde CDATA "&#195;" -- capital A, tilde -->
<!ENTITY Auml   CDATA "&#196;" -- capital A, dieresis or umlaut mark -->
<!ENTITY Ccedil CDATA "&#199;" -- capital C, cedilla -->
<!ENTITY ETH    CDATA "&#208;" -- capital Eth, Icelandic -->
<!ENTITY Eacute CDATA "&#201;" -- capital E, acute accent -->
<!ENTITY Ecirc  CDATA "&#202;" -- capital E, circumflex accent -->
<!ENTITY Egrave CDATA "&#200;" -- capital E, grave accent -->
<!ENTITY Euml   CDATA "&#203;" -- capital E, dieresis or umlaut mark -->
<!ENTITY Iacute CDATA "&#205;" -- capital I, acute accent -->
<!ENTITY Icirc  CDATA "&#206;" -- capital I, circumflex accent -->
<!ENTITY Igrave CDATA "&#204;" -- capital I, grave accent -->
<!ENTITY Iuml   CDATA "&#207;" -- capital I, dieresis or umlaut mark -->
<!ENTITY Ntilde CDATA "&#209;" -- capital N, tilde -->
<!ENTITY Oacute CDATA "&#211;" -- capital O, acute accent -->
<!ENTITY Ocirc  CDATA "&#212;" -- capital O, circumflex accent -->
<!ENTITY Ograve CDATA "&#210;" -- capital O, grave accent -->
<!ENTITY Oslash CDATA "&#216;" -- capital O, slash -->
<!ENTITY Otilde CDATA "&#213;" -- capital O, tilde -->
<!ENTITY Ouml   CDATA "&#214;" -- capital O, dieresis or umlaut mark -->
<!ENTITY THORN  CDATA "&#222;" -- capital THORN, Icelandic -->
<!ENTITY Uacute CDATA "&#218;" -- capital U, acute accent -->
<!ENTITY Ucirc  CDATA "&#219;" -- capital U, circumflex accent -->
<!ENTITY Ugrave CDATA "&#217;" -- capital U, grave accent -->
<!ENTITY Uuml   CDATA "&#220;" -- capital U, dieresis or umlaut mark -->
<!ENTITY Yacute CDATA "&#221;" -- capital Y, acute accent -->

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<!ENTITY aacute CDATA "&#225;" -- small a, acute accent -->
<!ENTITY acirc  CDATA "&#226;" -- small a, circumflex accent -->
<!ENTITY aelig  CDATA "&#230;" -- small ae diphthong (ligature) -->
<!ENTITY agrave CDATA "&#224;" -- small a, grave accent -->
<!ENTITY aring  CDATA "&#229;" -- small a, ring -->
<!ENTITY atilde CDATA "&#227;" -- small a, tilde -->
<!ENTITY auml   CDATA "&#228;" -- small a, dieresis or umlaut mark -->
<!ENTITY ccedil CDATA "&#231;" -- small c, cedilla -->
<!ENTITY eacute CDATA "&#233;" -- small e, acute accent -->
<!ENTITY ecirc  CDATA "&#234;" -- small e, circumflex accent -->
<!ENTITY egrave CDATA "&#232;" -- small e, grave accent -->
<!ENTITY eth    CDATA "&#240;" -- small eth, Icelandic -->
<!ENTITY euml   CDATA "&#235;" -- small e, dieresis or umlaut mark -->
<!ENTITY iacute CDATA "&#237;" -- small i, acute accent -->
<!ENTITY icirc  CDATA "&#238;" -- small i, circumflex accent -->
<!ENTITY igrave CDATA "&#236;" -- small i, grave accent -->
<!ENTITY iuml   CDATA "&#239;" -- small i, dieresis or umlaut mark -->
<!ENTITY ntilde CDATA "&#241;" -- small n, tilde -->
<!ENTITY oacute CDATA "&#243;" -- small o, acute accent -->
<!ENTITY ocirc  CDATA "&#244;" -- small o, circumflex accent -->
<!ENTITY ograve CDATA "&#242;" -- small o, grave accent -->
<!ENTITY oslash CDATA "&#248;" -- small o, slash -->
<!ENTITY otilde CDATA "&#245;" -- small o, tilde -->
<!ENTITY ouml   CDATA "&#246;" -- small o, dieresis or umlaut mark -->
<!ENTITY szlig  CDATA "&#223;" -- small sharp s, German(sz ligature)-->
<!ENTITY thorn  CDATA "&#254;" -- small thorn, Icelandic -->
<!ENTITY uacute CDATA "&#250;" -- small u, acute accent -->
<!ENTITY ucirc  CDATA "&#251;" -- small u, circumflex accent -->
<!ENTITY ugrave CDATA "&#249;" -- small u, grave accent -->
<!ENTITY uuml   CDATA "&#252;" -- small u, dieresis or umlaut mark -->
<!ENTITY yacute CDATA "&#253;" -- small y, acute accent -->
<!ENTITY yuml   CDATA "&#255;" -- small y, dieresis or umlaut mark -->

   5.3 HTML Level 0 DTD

      This is the Document Type Definition for the HyperText
      Markup Language as used by minimally conforming World Wide
      Web applications (HTML Level 0 DTD):

<!--    html-0.dtd

        Document Type Definition for the HyperText Markup Language
        as used by minimally conforming World Wide Web applications
        (HTML Level 0 DTD).

        $Id: html-0.dtd,v 1.9 1994/11/15 19:54:42 connolly Exp $

        Author: Daniel W. Connolly <connolly@hal.com>
        See Also: http://www.hal.com/%7Econnolly/html-spec/index.html
                  http://info.cern.ch/hypertext/WWW/MarkUp2/MarkUp.html

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-->

<!ENTITY % HTML.Version
        "-//IETF//DTD HTML Level 0//EN//2.0"
        -- public identifier for "minimal conformance" version    --

        -- Typical usage:

            <!DOCTYPE HTML PUBLIC
                "-//IETF//DTD HTML Level 0//EN">
            <html>
            ...
            </html>
        --
        >

<!-- Feature Test Entities -->

<!ENTITY % HTML.Highlighting "IGNORE">
<!ENTITY % HTML.Forms "IGNORE">

<!ENTITY % head.link " " -- no link in head at level 0 -->
<!ENTITY % linkExtraAttributes " ">

<!ENTITY % html PUBLIC "-//IETF//DTD HTML//EN//2.0">
%html;

   5.4 HTML Level 1 DTD

      This is the Document Type Definition for the HyperText
      Markup Language with Level 1 Extensions (HTML Level 1 DTD):

<!--    html-1.dtd

        Document Type Definition for the HyperText Markup Language
        with Level 1 Extensions (HTML Level 1 DTD).

        $Id: html-1.dtd,v 1.5 1994/09/23 22:46:54 connolly Exp $

        Author: Daniel W. Connolly <connolly@hal.com>
        See Also: http://www.hal.com/%7Econnolly/html-spec/index.html
                  http://info.cern.ch/hypertext/WWW/MarkUp2/MarkUp.html
-->

<!ENTITY % HTML.Version
        "-//IETF//DTD HTML Level 1//EN//2.0"

        -- Typical usage:

            <!DOCTYPE HTML PUBLIC

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                "-//IETF//DTD HTML Level 1//EN">
            <html>
            ...
            </html>
        --
        >

<!-- Feature Test Entities -->
<!ENTITY % HTML.Forms "IGNORE">

<!ENTITY % html PUBLIC "-//IETF//DTD HTML//EN//2.0">
%html;

6. DTD Element References

   Document type definition (DTD) element references are aids
   to reading and understanding the DTDs.

   6.1 Recommended Level 2 Element Reference

      This listing eliminates deprecated idioms. Consult this
      reference when generating new documents. This reference is
      available as hypertext at
      http://www.hal.com/%7Econnolly/html-spec/L2Pindex.html

HTML DTD Reference
Generated from
-//IETF//DTD HTML Recommended//EN//2.0

Alphabetical Index


A, ADDRESS, B, BASE, BLOCKQUOTE, BODY, BR, CITE, CODE, DD, DIR, DL, DT,
EM, FORM, H1, H2, H3, H4, H5, H6, HEAD, HR, HTML, I, IMG, INPUT, ISINDEX
, KBD, LI, LINK, MENU, META, NEXTID, OL, OPTION, P, PRE, SAMP, SELECT,
STRONG, TEXTAREA, TITLE, TT, UL, VAR,
------------------------------------------------------------------------

A

Required Parts
<A>characters... </A>
All Parts
<A HREF="..." NAME="..." REL="..." REV="..." URN="..." TITLE="..."
METHODS="..." >characters... <IMG> <BR> <EM> <STRONG> <CODE> <SAMP>
<KBD> <VAR> <CITE> <TT> <B> <I> </A>
Allowed In Content Of...
<ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5> <H6>
 <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>


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------------------------------------------------------------------------

ADDRESS

Required Parts
<ADDRESS>characters... </ADDRESS>
All Parts
<ADDRESS>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD>
<VAR> <CITE> <TT> <B> <I> </ADDRESS>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <FORM>

------------------------------------------------------------------------

B

Required Parts
<B>characters... </B>
All Parts
<B>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
<CITE> <TT> <B> <I> </B>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

BASE

Required Parts
<BASE HREF="..." >
All Parts
<BASE HREF="..." >
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

BLOCKQUOTE

Required Parts
<BLOCKQUOTE></BLOCKQUOTE>
All Parts
<BLOCKQUOTE><H1> <H2> <H3> <H4> <H5> <H6> <P> <UL> <OL> <DIR> <MENU>
<DL> <PRE> <BLOCKQUOTE> <FORM> <ISINDEX> <HR> <ADDRESS> </BLOCKQUOTE>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>

------------------------------------------------------------------------


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BODY

Required Parts
All Parts
<BODY><H1> <H2> <H3> <H4> <H5> <H6> <P> <UL> <OL> <DIR> <MENU> <DL>
<PRE> <BLOCKQUOTE> <FORM> <ISINDEX> <HR> <ADDRESS> </BODY>
Allowed In Content Of...
<HTML>

------------------------------------------------------------------------

BR

Required Parts
<BR>
All Parts
<BR>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

CITE

Required Parts
<CITE>characters... </CITE>
All Parts
<CITE>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD>
<VAR> <CITE> <TT> <B> <I> </CITE>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

CODE

Required Parts
<CODE>characters... </CODE>
All Parts
<CODE>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD>
<VAR> <CITE> <TT> <B> <I> </CODE>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

DD

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Required Parts
<DD>characters...
All Parts
<DD>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> <P> <UL> <OL> <DIR> <MENU> <DL> <PRE> <BLOCKQUOTE>
<FORM> <ISINDEX> </DD>
Allowed In Content Of...
<DL>

------------------------------------------------------------------------

DIR

Required Parts
<DIR></DIR>
All Parts
<DIR><LI> </DIR>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>

------------------------------------------------------------------------

DL

Required Parts
<DL></DL>
All Parts
<DL COMPACT><DT> <DD> </DL>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>

------------------------------------------------------------------------

DT

Required Parts
<DT>characters...
All Parts
<DT>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </DT>
Allowed In Content Of...
<DL>

------------------------------------------------------------------------

EM

Required Parts
<EM>characters... </EM>

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All Parts
<EM>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </EM>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

FORM

Required Parts
<FORM ACTION="..." ></FORM>
All Parts
<FORM ACTION="..." METHOD="..." ENCTYPE="..." ><H1> <H2> <H3> <H4> <H5>
<H6> <P> <UL> <OL> <DIR> <MENU> <DL> <PRE> <BLOCKQUOTE> <ISINDEX> <HR>
<ADDRESS> <INPUT> <SELECT> <TEXTAREA> </FORM>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>

------------------------------------------------------------------------

H1

Required Parts
<H1>characters... </H1>
All Parts
<H1>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </H1>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <FORM>

------------------------------------------------------------------------

H2

Required Parts
<H2>characters... </H2>
All Parts
<H2>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </H2>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <FORM>

------------------------------------------------------------------------

H3

Required Parts
<H3>characters... </H3>

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All Parts
<H3>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </H3>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <FORM>

------------------------------------------------------------------------

H4

Required Parts
<H4>characters... </H4>
All Parts
<H4>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </H4>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <FORM>

------------------------------------------------------------------------

H5

Required Parts
<H5>characters... </H5>
All Parts
<H5>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </H5>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <FORM>

------------------------------------------------------------------------

H6

Required Parts
<H6>characters... </H6>
All Parts
<H6>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </H6>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <FORM>

------------------------------------------------------------------------

HEAD

Required Parts
All Parts
<HEAD><TITLE> <ISINDEX> <BASE> <META> <NEXTID> <LINK> </HEAD>
Allowed In Content Of...

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<HTML>

------------------------------------------------------------------------

HR

Required Parts
<HR>
All Parts
<HR>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <FORM> <PRE>

------------------------------------------------------------------------

HTML

Required Parts
All Parts
<HTML VERSION="..." ><HEAD> <BODY> </HTML>
Allowed In Content Of...

------------------------------------------------------------------------

I

Required Parts
<I>characters... </I>
All Parts
<I>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
<CITE> <TT> <B> <I> </I>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

IMG

Required Parts
<IMG SRC="..." >
All Parts
<IMG SRC="..." ALT="..." ALIGN="..." ISMAP>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

INPUT

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Required Parts
<INPUT>
All Parts
<INPUT TYPE="..." NAME="..." VALUE="..." SRC="..." CHECKED SIZE="..."
MAXLENGTH="..." ALIGN="..." >
Allowed In Content Of...
<FORM>

------------------------------------------------------------------------

ISINDEX

Required Parts
<ISINDEX>
All Parts
<ISINDEX>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <FORM> <HEAD> <LI>

------------------------------------------------------------------------

KBD

Required Parts
<KBD>characters... </KBD>
All Parts
<KBD>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD>
<VAR> <CITE> <TT> <B> <I> </KBD>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

LI

Required Parts
<LI>characters...
All Parts
<LI>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> <P> <UL> <OL> <DIR> <MENU> <DL> <PRE> <BLOCKQUOTE>
<FORM> <ISINDEX> </LI>
Allowed In Content Of...
<DIR> <MENU> <OL> <UL>

------------------------------------------------------------------------

LINK


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Required Parts
<LINK HREF="..." >
All Parts
<LINK HREF="..." REL="..." REV="..." URN="..." TITLE="..."
METHODS="..." >
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

MENU

Required Parts
<MENU></MENU>
All Parts
<MENU><LI> </MENU>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>

------------------------------------------------------------------------

META

Required Parts
<META CONTENT="..." >
All Parts
<META HTTP-EQUIV="..." NAME="..." CONTENT="..." >
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

NEXTID

Required Parts
<NEXTID N="..." >
All Parts
<NEXTID N="..." >
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

OL

Required Parts
<OL></OL>
All Parts
<OL><LI> </OL>
Allowed In Content Of...

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<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>

------------------------------------------------------------------------

OPTION

Required Parts
<OPTION>characters...
All Parts
<OPTION SELECTED VALUE="..." >characters... </OPTION>
Allowed In Content Of...
<SELECT>

------------------------------------------------------------------------

P

Required Parts
<P>characters...
All Parts
<P>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
<CITE> <TT> <B> <I> </P>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>

------------------------------------------------------------------------

PRE

Required Parts
<PRE>characters... </PRE>
All Parts
<PRE WIDTH="..." >characters... <A> <HR> <BR> <TT> <B> <I> <EM> <STRONG>
 <CODE> <SAMP> <KBD> <VAR> <CITE> </PRE>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>

------------------------------------------------------------------------

SAMP

Required Parts
<SAMP>characters... </SAMP>
All Parts
<SAMP>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD>
<VAR> <CITE> <TT> <B> <I> </SAMP>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>


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------------------------------------------------------------------------

SELECT

Required Parts
<SELECT NAME="..." ></SELECT>
All Parts
<SELECT NAME="..." SIZE="..." MULTIPLE><OPTION> </SELECT>
Allowed In Content Of...
<FORM>

------------------------------------------------------------------------

STRONG

Required Parts
<STRONG>characters... </STRONG>
All Parts
<STRONG>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD>
<VAR> <CITE> <TT> <B> <I> </STRONG>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

TEXTAREA

Required Parts
<TEXTAREA NAME="..." ROWS="..." COLS="..." >characters... </TEXTAREA>
All Parts
<TEXTAREA NAME="..." ROWS="..." COLS="..." >characters... </TEXTAREA>
Allowed In Content Of...
<FORM>

------------------------------------------------------------------------

TITLE

Required Parts
<TITLE>characters... </TITLE>
All Parts
<TITLE>characters... </TITLE>
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

TT


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Required Parts
<TT>characters... </TT>
All Parts
<TT>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD> <VAR>
 <CITE> <TT> <B> <I> </TT>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

------------------------------------------------------------------------

UL

Required Parts
<UL></UL>
All Parts
<UL COMPACT><LI> </UL>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <FORM> <LI>

------------------------------------------------------------------------

VAR

Required Parts
<VAR>characters... </VAR>
All Parts
<VAR>characters... <A> <IMG> <BR> <EM> <STRONG> <CODE> <SAMP> <KBD>
<VAR> <CITE> <TT> <B> <I> </VAR>
Allowed In Content Of...
<A> <ADDRESS> <B> <CITE> <CODE> <DD> <DT> <EM> <H1> <H2> <H3> <H4> <H5>
<H6> <I> <KBD> <LI> <P> <PRE> <SAMP> <STRONG> <TT> <VAR>

   6.2  Recommended Level 0 Element Reference

      This listing eliminates deprecated idioms. Consult this
      reference when generating new documents aimed at minimally
      conforming implementations. This reference is available as
      hypertext at
      http://www.hal.com/%7Econnolly/html-spec/L0Pindex.html

HTML DTD Reference

Generated from
-//IETF//DTD HTML Level 0 Recommended//EN//2.0

Alphabetical Index


A, ADDRESS, BASE, BLOCKQUOTE, BODY, BR, DD, DIR, DL, DT, H1, H2, H3,

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H4, H5, H6, HEAD, HR, HTML, IMG, ISINDEX, LI, LINK, MENU, META,
NEXTID, OL, P, PRE, TITLE, UL,
------------------------------------------------------------------------

A

Required Parts
<A>characters... </A>
All Parts
<A HREF="..." NAME="..." >characters... <IMG> <BR> </A>
Allowed In Content Of...
<ADDRESS> <DD> <DT> <H1> <H2> <H3> <H4> <H5> <H6> <LI> <P> <PRE>

------------------------------------------------------------------------

ADDRESS

Required Parts
<ADDRESS>characters... </ADDRESS>
All Parts
<ADDRESS>characters... <A> <IMG> <BR> </ADDRESS>
Allowed In Content Of...
<BLOCKQUOTE> <BODY>

------------------------------------------------------------------------

BASE

Required Parts
<BASE HREF="..." >
All Parts
<BASE HREF="..." >
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

BLOCKQUOTE

Required Parts
<BLOCKQUOTE></BLOCKQUOTE>
All Parts
<BLOCKQUOTE><H1> <H2> <H3> <H4> <H5> <H6> <P> <UL> <OL> <DIR> <MENU>
<DL> <PRE> <BLOCKQUOTE> <HR> <ADDRESS> </BLOCKQUOTE>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>

------------------------------------------------------------------------

BODY

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Required Parts
All Parts
<BODY><H1> <H2> <H3> <H4> <H5> <H6> <P> <UL> <OL> <DIR> <MENU> <DL>
<PRE> <BLOCKQUOTE> <HR> <ADDRESS> </BODY>
Allowed In Content Of...
<HTML>

------------------------------------------------------------------------

BR

Required Parts
<BR>
All Parts
<BR>
Allowed In Content Of...
<A> <ADDRESS> <DD> <DT> <H1> <H2> <H3> <H4> <H5> <H6> <LI> <P> <PRE>

------------------------------------------------------------------------

DD

Required Parts
<DD>characters...
All Parts
<DD>characters... <A> <IMG> <BR> <P> <UL> <OL> <DIR> <MENU> <DL> <PRE>
<BLOCKQUOTE> </DD>
Allowed In Content Of...
<DL>

------------------------------------------------------------------------

DIR

Required Parts
<DIR></DIR>
All Parts
<DIR><LI> </DIR>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>

------------------------------------------------------------------------

DL

Required Parts
<DL></DL>
All Parts
<DL COMPACT><DT> <DD> </DL>

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Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>

------------------------------------------------------------------------

DT

Required Parts
<DT>characters...
All Parts
<DT>characters... <A> <IMG> <BR> </DT>
Allowed In Content Of...
<DL>

------------------------------------------------------------------------

H1

Required Parts
<H1>characters... </H1>
All Parts
<H1>characters... <A> <IMG> <BR> </H1>
Allowed In Content Of...
<BLOCKQUOTE> <BODY>

------------------------------------------------------------------------

H2

Required Parts
<H2>characters... </H2>
All Parts
<H2>characters... <A> <IMG> <BR> </H2>
Allowed In Content Of...
<BLOCKQUOTE> <BODY>

------------------------------------------------------------------------

H3

Required Parts
<H3>characters... </H3>
All Parts
<H3>characters... <A> <IMG> <BR> </H3>
Allowed In Content Of...
<BLOCKQUOTE> <BODY>

------------------------------------------------------------------------

H4

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Required Parts
<H4>characters... </H4>
All Parts
<H4>characters... <A> <IMG> <BR> </H4>
Allowed In Content Of...
<BLOCKQUOTE> <BODY>

------------------------------------------------------------------------

H5

Required Parts
<H5>characters... </H5>
All Parts
<H5>characters... <A> <IMG> <BR> </H5>
Allowed In Content Of...
<BLOCKQUOTE> <BODY>

------------------------------------------------------------------------

H6

Required Parts
<H6>characters... </H6>
All Parts
<H6>characters... <A> <IMG> <BR> </H6>
Allowed In Content Of...
<BLOCKQUOTE> <BODY>

------------------------------------------------------------------------

HEAD

Required Parts
All Parts
<HEAD><TITLE> <ISINDEX> <BASE> <META> <NEXTID> </HEAD>
Allowed In Content Of...
<HTML>

------------------------------------------------------------------------

HR

Required Parts
<HR>
All Parts
<HR>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <PRE>

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------------------------------------------------------------------------

HTML

Required Parts
All Parts
<HTML VERSION="..." ><HEAD> <BODY> </HTML>
Allowed In Content Of...

------------------------------------------------------------------------

IMG

Required Parts
<IMG SRC="..." ALT="..." >
All Parts
<IMG SRC="..." ALT="..." ALIGN="..." ISMAP>
Allowed In Content Of...
<A> <ADDRESS> <DD> <DT> <H1> <H2> <H3> <H4> <H5> <H6> <LI> <P>

------------------------------------------------------------------------

ISINDEX

Required Parts
<ISINDEX>
All Parts
<ISINDEX>
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

LI

Required Parts
<LI>characters...
All Parts
<LI>characters... <A> <IMG> <BR> <P> <UL> <OL> <DIR> <MENU> <DL> <PRE>
<BLOCKQUOTE> </LI>
Allowed In Content Of...
<DIR> <MENU> <OL> <UL>

------------------------------------------------------------------------

LINK

Required Parts
<LINK HREF="..." >

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All Parts
<LINK HREF="..." >
Allowed In Content Of...

------------------------------------------------------------------------

MENU

Required Parts
<MENU></MENU>
All Parts
<MENU><LI> </MENU>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>

------------------------------------------------------------------------

META

Required Parts
<META CONTENT="..." >
All Parts
<META HTTP-EQUIV="..." NAME="..." CONTENT="..." >
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

NEXTID

Required Parts
<NEXTID N="..." >
All Parts
<NEXTID N="..." >
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

OL

Required Parts
<OL></OL>
All Parts
<OL><LI> </OL>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>

------------------------------------------------------------------------


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P

Required Parts
<P>characters...
All Parts
<P>characters... <A> <IMG> <BR> </P>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>

------------------------------------------------------------------------

PRE

Required Parts
<PRE>characters... </PRE>
All Parts
<PRE WIDTH="..." >characters... <A> <HR> <BR> </PRE>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>

------------------------------------------------------------------------

TITLE

Required Parts
<TITLE>characters... </TITLE>
All Parts
<TITLE>characters... </TITLE>
Allowed In Content Of...
<HEAD>

------------------------------------------------------------------------

UL

Required Parts
<UL></UL>
All Parts
<UL COMPACT><LI> </UL>
Allowed In Content Of...
<BLOCKQUOTE> <BODY> <DD> <LI>


7. Glossary

   The HTML specification uses these words with precise
   meanings:

   attribute


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      A syntactical component of an HTML element which is
      often used to specify a characteristic quality of an
      element, other than type or content.

   document type definition (DTD)

      A DTD is a collection of declarations (entity, element,
      attribute, link, map, etc.) in SGML syntax that defines
      the components and structures available for a class
      (type) of documents.

   element

      A component of the hierarchical structure defined by the
      document type definition; it is identified in a document
      instance by descriptive markup, usually a start-tag and
      an end-tag.

   HTML

      HyperText Markup Language.

   HTML user agent

      Any tool used with HTML documents.

   HTML document

      A collection of information represented as a sequence of
      characters. An HTML document consists of data characters
      and markup. In particular, the markup describes a
      structure conforming to the HTML document type
      definition.

   HTTP

      A generic stateless object-oriented protocol, which may
      be used for many similar tasks by extending the
      commands, or "methods", used. For example, you might use
      HTTP for name servers and distributed object-oriented
      systems, With HTTP, the negotiation of data
      representation allows systems to be built independent of
      the development of new representations. For more
      information see:
      http://info.cern.ch/hypertext/WWW/Protocols/HTTP/HTTP2.html

   (document) instance

      The document itself including the actual content with
      the actual markup. Can be a single document or part of a

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      document instance set that follows the DTD.

   markup

      Text added to the data of a document to convey
      information about it. There are four different kinds of
      markup: descriptive markup (tags), references, markup
      declarations, and processing instructions.

   Multipurpose Internet Mail Extensions (MIME)

      An extension to Internet email which provides the
      ability to transfer non-textual data, such as graphics,
      audio and fax. It is defined in RFC 1341.

   representation

      The encoding of information for interchange. For
      example, HTML is a representation of hypertext.

   rendering

      Formatting and presenting information.

   SGML

      Standard Generalized Markup Language is a data encoding
      that allows the information in documents to be shared -
      either by other document publishing systems or by
      applications for electronic delivery, configuration
      management, database management, inventory control, etc.
      Defined in ISO 8879:1986 Information Processing Text and
      Office Systems; Standard Generalized Markup Language
      (SGML).

   SGMLS

      An SGML parser by James Clark, jjc@jclark.com, derived
      from the ARCSGML parser materials which were written by
      Charles F. Goldfarb. The source is available at
      ftp.ifi.uio.no/pub/SGML/SGMLS.

   tag

      Descriptive markup. There are two kinds of tags; start-
      tags and end-tags.

   URI

      Universal Resource Identifiers (URIs) is the name for a

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      generic WWW identifier. The URI specification simply
      defines the syntax for encoding arbitrary naming or
      addressing schemes, and has a list of such schemes. See
      also: http://info.cern.ch/hypertext/WWW/Addressing/Addressing.html

   WWW

      A hypertext-based, distributed information system
      created by researchers at CERN in Switzerland. Users may
      create, edit or browse hypertext documents. The clients
      and servers are freely available.See also:
      http://info.cern.ch/hypertext/WWW/TheProject.html

   7.1 Imperatives

      may

         The implementation is not obliged to follow this in any
         way.

      must

         If this is not followed, the implementation does not
         conform to this specification.

      shall

         If this is not followed, the implementation does not
         conform to this specification.

      should

         If this is not followed, though the implementation
         officially conforms to the specification, undesirable
         results may occur in practice.

      typical

         Typical rendering is described for many elements. This
         is not a mandatory part of the specification but is
         given as guidance for designers and to help explain the
         uses for which the elements were intended.

8. References

   The HTML specification cites these works:

   HTTP

      HTTP: A Protocol for Networked Information. This

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      document is available at
      http://info.cern.ch/hypertext/WWW/Protocols/HTTP/HTTP2.h
      tml.

   MIME

      N. Borenstein, N. Freed, MIME (Multipurpose Internet
      Mail Extensions) Part One: Mechanisms for Specifying and
      Describing the Format of Internet Message Bodies,
      09/23/1993. (Pages=81) (Format=.txt, .ps) (Obsoletes
      RFC1341) (Updated by RFC1590).

   SGML

      ISO Standard 8879:1986 Information Processing Text and
      Office Systems; Standard Generalized Markup Language
      (SGML).

   SGMLS

      An SGML parser by James Clark, jjc@jclark.com, derived
      from the ARCSGML parser materials which were written by
      Charles F. Goldfarb. The source is available at
      ftp.ifi.uio.no/pub/SGML/SGMLS.

   URI

      Universal Resource Identifiers. Available by anonymous
      FTP as Postscript (info.cern.ch/pub/www/doc/url.ps) or
      text (info.cern.ch/pub/www/doc/url.txt)

   WWW

      The World Wide Web , a global information initiative.
      For bootstrap information, telnet info.cern.ch or find
      documents by ftp://info.cern.ch/pub/www/doc.

9. Acknowledgments

   The HTML document type was designed by Tim Berners-Lee
   at CERN as part of the 1990 World Wide Web project. In
   1992, Dan Connolly wrote the HTML Document Type
   Definition (DTD) and a brief HTML specification.

   Since 1993, a wide variety of Internet participants have
   contributed to the evolution of HTML, which has included
   the addition of in-line images introduced by the NCSA
   Mosaic software for WWW. Dave Raggett played an
   important role in deriving the FORMS material from the
   HTML+ specification.

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   Dan Connolly and Karen Olson Muldrow rewrote the HTML
   Specification in 1994.

   Special thanks to the many people who have contributed
   to this specification:

   -  Terry Allen; O'Reilly & Associates; terry@ora.com

   -  Marc Andreessen; Netscape Communications Corp;
      marca@mcom.com

   -  Paul Burchard; The Geometry Center, University of
      Minnesota; burchard@geom.umn.edu

   -  James Clark; jjc@jclark.com

   -  Daniel W. Connolly; HaL Computer Systems; connolly@hal.com

   -  Roy Fielding; University of California, Irvine;
      fielding@ics.uci.edu

   -  Peter Flynn; University College Cork, Ireland; pflynn@www.ucc.ie

   -  Jay Glicksman; Enterprise Integration Technology; jay@eit.com

   -  Paul Grosso; ArborText, Inc.; paul@arbortext.com

   -  Eduardo Gutentag; Sun Microsystems; eduardo@Eng.Sun.com

   -  Bill Hefley; Software Engineering Institute,
      Carnegie Mellon University; weh@sei.cmu.edu

   -  Chung-Jen Ho; Xerox Corporation; cho@xsoft.xerox.com

   -  Mike Knezovich; Spyglass, Inc.; mike@spyglass.com

   -  Tim Berners-Lee; CERN; timbl@info.cern.ch

   -  Tom Magliery; NCSA; mag@ncsa.uiuc.edu

   -  Murray Maloney; Toronto Development Centre, The
      Santa Cruz Operation (SCO); murray@sco.com

   -  Larry Masinter; Xerox Palo Alto Research Center;
      masinter@parc.xerox.com

   -  Karen Olson Muldrow; HaL Computer Systems; karen@hal.com

   -  Bill Perry, Spry, Inc., wmperry@spry.com

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                                HTML 2.0             November 28, 1994


   -  Dave Raggett, Hewlett Packard, dsr@hplb.hpl.hp.com

   -  E. Corprew Reed; Cold Spring Harbor Laboratory; corp@cshl.org

   -  Yuri Rubinsky; SoftQuad, Inc.; yuri@sq.com

   -  Eric Schieler; Spyglass, Inc.; eschieler@spyglass.com

   -  Eric W. Sink; Spyglass, Inc.; eric@spyglass.com

   -  Stuart Weibel; OCLC Office of Research; weibel@oclc.org

   -  Chris Wilson; Spry, Inc.; cwilson@spry.com

10. Author's Addresses

   Tim Berners-Lee
   timbl@quag.lcs.mit.edu


   Daniel W. Connolly
   Hal Software Systems
   3006A Longhorn Blvd.
   Austin, TX 78758

   phone: (512) 834-9962 extension 5010
   fax:   (512) 823-9963
   URL:   http://www.hal.com/~connolly
   email: connolly@hal.com

