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revision 1.15 by connolly, Fri Jun 3 22:09:14 1994 UTC revision 1.16 by connolly, Mon Jun 13 20:55:50 1994 UTC
# Line 1  Line 1 
1  <!--    html.dtd  <!--    html.dtd
2    
3          Document Type Definition for the HyperText Markup Language          Document Type Definition for the HyperText Markup Language (HTML DTD)
         as used by the World Wide Web (HTML DTD).  
4    
5          $Id$          $Id$
6    
7          Author: Daniel W. Connolly <connolly@hal.com>          Author: Daniel W. Connolly <connolly@hal.com>
8          See Also: http://www.hal.com/%7Econnolly/html-spec/HTML.html          See Also: html.decl, html-0.dtd, html-1.dtd
9                      http://www.hal.com/%7Econnolly/html-spec/index.html
10                    http://info.cern.ch/hypertext/WWW/MarkUp2/MarkUp.html                    http://info.cern.ch/hypertext/WWW/MarkUp2/MarkUp.html
11  -->  -->
12    
13  <!ENTITY HTML.Version  <!ENTITY HTML.Version
14          "-//W3O//DTD WWW HTML 2.0//EN"          "-//W3O//DTD WWW HTML 2.0//EN"
         -- public identifier for "current pracitice" version             --  
15    
16          -- Typical usage:          -- Typical usage:
17    
# Line 24  Line 23 
23          >          >
24    
25    
26  <!-- Feature Test Entities -->  <!-- Imported Names -->
   
 <!-- To use these, write your document like:  
         <!DOCTYPE HTML [  
         <!ENTITY % HTML.Optional "INCLUDE">  
         <!ENTITY % html PUBLIC "-//connolly hal.com//DTD WWW HTML 1.8//EN">  
         %html;  
         ]>  
         <TITLE>Here's my doc</TITLE>  
         <p>It uses lots of optional features  
   
  In practice, if you're using sgmls to validate your docs,  
  you can stick the <!DOCTYPE [...]> in a separate file and  
  validate with:  
         sgmls -s doctype.sgml foo.html  
  -->  
   
 <!ENTITY % HTML.Level0  "IGNORE">  
 <!ENTITY % HTML.Obsolete "IGNORE">  
 <!ENTITY % HTML.Prescriptive "IGNORE">  
   
 <![ %HTML.Level0 [  
         <!ENTITY % HTML.linkRelationships "IGNORE">  
         <!ENTITY % HTML.linkMethods "IGNORE">  
         <!ENTITY % HTML.linkRedundantInfo "IGNORE">  
         <!ENTITY % HTML.forms "IGNORE">  
         <!ENTITY % HTML.phrase "IGNORE">  
         <!ENTITY % HTML.NEXTID "IGNORE">  
         <!-- @# Are the following required for conformance? -->  
         <!-- @# nested lists -->  
         <!-- @# IMG -->  
         <!-- @# headers inside A -->  
         <!-- @# nested phrases, fonts -->  
         ]]>  
           
 <![ %HTML.Obsolete [  
         <!ENTITY % HTML.titleCDATA "INCLUDE">  
         <!ENTITY % HTML.litCDATA "INCLUDE">  
         <!ENTITY % HTML.pSeparator "INCLUDE">  
         ]]>  
   
 <![ %HTML.Prescriptive [  
         <!--  
         This feature test entity prescribes that certain  
         idioms detract from the structural integrity of an  
         HTML document, and are therefore disallowed.  
         -->  
         <!ENTITY % HTML.font-phrase "IGNORE">  
         <!ENTITY % HTML.anchorNameCDATA "IGNORE">  
         <!ENTITY % HTML.PLAINTEXT "IGNORE">  
         <!ENTITY % HTML.bodyBlockOnly "INCLUDE">  
         ]]>  
   
 <!ENTITY % HTML.phrase "INCLUDE"  
         -- phrase markup, ala TeXinfo: TT, EM, etc.  
         -->  
   
 <!ENTITY % HTML.bodyBlockOnly "IGNORE"  
         -- only allow block elements in the BODY element  
         This means all paragraphs need to start with a <P> tag.  
         -->  
   
 <!ENTITY % HTML.pSeparator "IGNORE"  
         -- use P element as paragraph separator, rather that container.  
         -->  
   
 <!ENTITY % HTML.linkRelationships "INCLUDE"  
         -- Adding markup to links to show the relationship between  
         ends of a link  
         see http://info.cern.ch/hypertext/WWW/MarkUp/Relationships.html  
         -->  
   
 <!ENTITY % HTML.linkMethods "INCLUDE"  
         -- Adding markup to links to show the methods supported  
         by the referent object  
         see http://info.cern.ch/hypertext/WWW/MarkUp/Elements/A.html  
         -->  
   
 <!ENTITY % HTML.linkRedundantInfo "INCLUDE"  
         -- Adding markup to links to give redundant information  
         like URN, content type, title...  
         -->  
   
 <!ENTITY % HTML.anchorNameCDATA "INCLUDE"  
         -- Anchor names should be distinct. SGML parser can validate  
         this if the NAME attribute of the A element is declared as ID.  
         But that restricts the syntax of an anchor name to an SGML name,  
         i.e. a letter followed by letters, numbers, periods and dashes,  
         up to NAMELEN (34) characters long.  
         -->  
   
 <!ENTITY % HTML.PLAINTEXT "INCLUDE"  
         -- Support for the <PLAINTEXT> tag as a sign of the  
         end of th HTML data stream and the beginning of a stream  
         of text/plain data  
         -->  
   
 <!ENTITY % HTML.titleCDATA "IGNORE"  
         -- Is the TITLE element #PCDATA, RCDATA, or CDATA content?  
         On Mosaic, it's #PCDATA, but in the linemode browser,  
         it's more like CDATA, but not quite.  
         -->  
   
 <!ENTITY % HTML.NEXTID "INCLUDE"  
         -- Used by the NeXT implementation to keep track of the  
         next anchor id to use  
         -->  
   
 <!ENTITY % HTML.font-phrase "INCLUDE"  
         -- allow B, I, TT, U outside PRE,  
         CITE, VAR, etc. inside PRE  
         -->  
   
 <!ENTITY % HTML.KEY "IGNORE"  
         -- There was once a KEY element, for keyboard keys, menu items,  
         buttons, etc. but it's not supported or widely documented  
         -->  
   
 <!ENTITY % HTML.U "IGNORE"  
         -- There was also a U element, but since it clashes with  
         the common pracitce of underlining hypertext links, it is  
         not widely supported  
         -->  
   
 <!ENTITY % HTML.litCDATA "IGNORE"  
         -- treat XMP, LISTING as CDATA, as per linemodeWWW  
         -->  
   
 <!ENTITY % HTML.forms "INCLUDE"  
         -- Support for forms as per  
 http://www.ncsa.uiuc.edu/SDG/Software/Mosaic/Docs/fill-out-forms/overview.html  
         -->  
   
 <!-- DTD definitions -->  
   
 <!ENTITY % heading "H1|H2|H3|H4|H5|H6" >  
 <!ENTITY % list " UL | OL | DIR | MENU ">  
 <!ENTITY % literal " XMP | LISTING ">  
   
 <!ENTITY % URI "CDATA"  
         -- The term URI means a CDATA attribute  
            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  
   
         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.  
   
         -->  
27    
28  <!ENTITY % Content-Type "CDATA"  <!ENTITY % Content-Type "CDATA"
29          -- meaning a MIME content type, as per RFC1521          -- meaning a MIME content type, as per RFC1521
30          -->          -->
31    
32  <![ %HTML.anchorNameCDATA [ <!ENTITY % anchor-name "CDATA"> ]]>  <!ENTITY % HTTP-Method "GET | POST">
 <!ENTITY % anchor-name "ID">  
   
 <![ %HTML.linkRelationships [ <!ENTITY % linkRelAttrs "  
         REL CDATA #IMPLIED -- forward relationship type --  
         REV CDATA #IMPLIED -- reversed relationship type  
                               to referent data:  
   
                                 PARENT CHILD, SIBLING, NEXT, TOP,  
                                 DEFINITION, UPDATE, ORIGINAL etc. --  
         "> ]]>  
 <!ENTITY % linkRelAttrs "">  
   
 <![ %HTML.linkRedundantInfo [ <!ENTITY % linkRedundantAttrs "  
         URN CDATA #IMPLIED -- universal resource number --  
   
         TITLE CDATA #IMPLIED -- advisory only --  
         "> ]]>  
 <!ENTITY % linkRedundantAttrs "">  
   
 <![ %HTML.linkMethods [ <!ENTITY % linkMethodAttrs "  
         METHODS NAMES #IMPLIED -- supported public methods of the object:  
                                         TEXTSEARCH, GET, HEAD, ... --  
         "> ]]>  
 <!ENTITY % linkMethodAttrs "">  
   
 <!ENTITY % linkattributes  
         "NAME %anchor-name #IMPLIED  
         HREF %URI;  #IMPLIED  
         %linkRelAttrs;  
         %linkRedundantAttrs;  
         %linkMethodAttrs;  
         ">  
   
   
 <!-- Document Element -->  
   
   
 <![ %HTML.PLAINTEXT [ <!ENTITY % obsolete-plaintext ", PLAINTEXT?"> ]]>  
 <!ENTITY % obsolete-plaintext "">  
   
 <!ENTITY % html-content "HEAD, BODY %obsolete-plaintext;">  
 <!ELEMENT HTML O O  (%html-content)>  
   
 <![ %HTML.NEXTID [  <!ENTITY % head-content "TITLE? & ISINDEX? & LINK* & BASE?  
                         & NEXTID?"> ]]>  
 <!ENTITY % head-content "TITLE & ISINDEX? & LINK* & BASE?">  
 <!ELEMENT HEAD O O  (%head-content)>  
   
 <![ %HTML.titleCDATA [ <!ENTITY % title-content "CDATA"> ]]>  
 <!ENTITY % title-content "(#PCDATA)">  
 <!ELEMENT TITLE - -  %title-content  
           -- The TITLE element is not considered part of the flow of text.  
              It should be displayed, for example as the page header or  
              window title.  
           -->  
   
 <!ELEMENT ISINDEX - O EMPTY  
           -- WWW clients should offer the option to perform a search on  
              documents containing ISINDEX.  
           -->  
   
 <!ELEMENT NEXTID - O EMPTY>  
 <!ATTLIST NEXTID N %anchor-name #REQUIRED  
           -- The number should be a name suitable for use  
              for the ID of a new element. When used, the value  
              has its numeric part incremented. EG Z67 becomes Z68  
           -->  
 <!ELEMENT LINK - O EMPTY>  
 <!ATTLIST LINK  
         %linkattributes>  
           
 <!ELEMENT BASE - O EMPTY    -- Reference context for URIs -->  
 <!ATTLIST BASE  
   
         HREF %URI; #REQUIRED  
   
         >  
   
 <![ %HTML.KEY [  
         <!ENTITY % key-emph "| KEY">  
         ]]>  
 <!ENTITY % key-emph "">  
   
 <![ %HTML.U [  
         <!ENTITY % u-font "| U">  
         ]]>  
 <!ENTITY % u-font "">  
   
 <!ENTITY % font "TT | B | I %u-font">  
 <!ENTITY % phrase "EM | STRONG | CODE | SAMP | KBD | VAR | DFN | CITE  
          | STRIKE %key-emph">  
   
   
 <![ %HTML.font-phrase [  
         <!ENTITY % obsolete-font "| %font">  
         <!ENTITY % obsolete-phrase "| %phrase">  
         ]]>  
 <!ENTITY % obsolete-font "">  
 <!ENTITY % obsolete-phrase "">  
 <![ %HTML.pSeparator [  
         <!ENTITY % obsolete-p "| P">  
         ]]>  
 <!ENTITY % obsolete-p "">  
   
 <!ENTITY % inline "%phrase %obsolete-font">  
 <!ENTITY % pre-inline "%font %obsolete-phrase %obsolete-p">  
   
 <!ENTITY % inline "">  
 <!ENTITY % pre-inline "">  
   
 <!ENTITY % text "#PCDATA | IMG | %inline | BR %obsolete-p">  
   
 <!ENTITY % htext "A | %text"    -- Plus links, no structure -->  
   
 <![ %HTML.font-phrase [ <!ENTITY % font-content "(%htext)+"> ]]>  
 <!ENTITY % font-content "#PCDATA">  
 <!ELEMENT (%font;) - - (%font-content;)>  
   
 <![ %HTML.phrase [  
 <!ELEMENT (%phrase;) - - (%htext)+>  
 ]]>  
   
 <!ENTITY % pre "PRE | XMP | LISTING">  
   
 <![ %HTML.forms [ <!ENTITY % block-form "| FORM | ISINDEX"> ]]>  
 <!ENTITY % block-form "">  
   
 <![ %HTML.pSeparator [  
         <!ENTITY % obsolete-htext "| %htext">  
         <!ENTITY % block-p "">  
         ]]>  
 <!ENTITY % obsolete-htext "| A">  
 <!ENTITY % block-p "| P ">  
   
 <!ENTITY % block "HR | %list | DL  
                 | %pre | BLOCKQUOTE | ADDRESS  
                 %block-form %block-p">  
   
   
 <![ %HTML.bodyBlockOnly [  
         <!ENTITY % current-htext "">  
         ]]>  
 <!ENTITY % current-htext "| %htext">  
   
 <!ENTITY % body-content "%heading | %block %current-htext">  
 <!ELEMENT BODY O O  (%body-content)*>  
   
   
 <!ELEMENT A     - - (%heading|%block|%text)+ -(A)  
         -- @# Technically, this allows silliness like:  
                 <H2><A>xyz<H1>h1</H1></A></H2>  
         The right way to do anchors outside of %htext is more like:  
                 <as id=z1><H2>lkjlkj</h2><ae start=z1>  
         -->  
 <!ATTLIST A  
         %linkattributes;  
         >  
   
 <!ELEMENT IMG    - O EMPTY --  Embedded image -->  
 <!ATTLIST IMG  
         SRC %URI;  #IMPLIED     -- URI of document to embed --  
         ALT CDATA #IMPLIED  
         ALIGN (top|middle|bottom) #IMPLIED  
         ISMAP (ISMAP) #IMPLIED  
         >  
   
   
 <![ %HTML.pSeparator [ <!ENTITY % p-content "EMPTY"> ]]>  
 <!ENTITY % p-content "(%htext)+">  
 <!ELEMENT P     - O %p-content>  
 <!ELEMENT HR    - O EMPTY -- horizontal rule -->  
 <!ELEMENT BR    - O EMPTY -- @# BR -> &br; -->  
   
 <!ELEMENT ( %heading )  - -  (%htext;)+>  
   
 <!ELEMENT DL    - -  (DT*, DD?)+>  
 <!ATTLIST DL  
         COMPACT (COMPACT) #IMPLIED>  
   
 <!ELEMENT DT    - O (%htext)+>  
 <!ELEMENT DD    - O (%htext|%block)+>  
   
 <!ELEMENT (%list) - -  (LI)+>  
   
 <!ELEMENT LI    - O (%htext|%block)+>  
   
 <!ELEMENT BLOCKQUOTE - - (%htext|%block)+ -- @# Hmm... --  
         -- for quoting some other source -->  
   
 <!ELEMENT ADDRESS - - (%htext;|%block)+>  
   
 <!ELEMENT PRE - - (#PCDATA|%pre-inline|A)+>  
 <!ATTLIST PRE  
         WIDTH NUMBER #implied  
         >  
   
 <!-- Mnemonic character entities. -->  
33    
 <!ENTITY % ISOlat1 PUBLIC  
   "ISO 8879:1986//ENTITIES Added Latin 1//EN">  
 %ISOlat1;  
34    
35  <!ENTITY #DEFAULT SDATA "&#38;unkown;" --display the markup-->  <!-- Include level 1 DTD + block extensions -->
 <!ENTITY amp CDATA "&#38;"     -- ampersand -->  
 <!ENTITY gt CDATA "&#62;"      -- greater than -->  
 <!ENTITY lt CDATA "&#60;"      -- less than -->  
 <!ENTITY quot CDATA "&#34;"    -- double quote -->  
36    
37  <!-- Processing Entities -->  <!ENTITY % block-2 "| FORM | ISINDEX"
38            --@# ISINDEX in BODY? -->
39    
40  <!ENTITY nbsp "<? nonbreaking-space>">  <!ENTITY % html-1 PUBLIC "-//W3O//DTD WWW HTML 2.0 Level 1//EN">
41  <!-- @# should add entites for processing instructions  %html-1;
         for line break, centering, etc. -->  
42    
43    
44  <!-- Forms  -->  <!-- Forms  -->
 <![ %HTML.forms [  
45    
46  <!ENTITY % HTTP-Method "(GET | POST)">  <!ELEMENT FORM - - %body.content -(FORM) +(INPUT|SELECT|TEXTAREA)>
 <!ELEMENT FORM - - (%body-content)* -(FORM) +(INPUT|SELECT|TEXTAREA)>  
47  <!ATTLIST FORM  <!ATTLIST FORM
48          ACTION %URI #REQUIRED          ACTION %URI #REQUIRED
49          METHOD %HTTP-Method #IMPLIED -- @# MAILTO? --          METHOD (%HTTP-Method) #IMPLIED -- @# MAILTO? --
50          ENCTYPE %Content-Type; #IMPLIED          ENCTYPE %Content-Type; #IMPLIED
51          >          >
52    
# Line 441  http://www.ncsa.uiuc.edu/SDG/Software/Mo Line 84  http://www.ncsa.uiuc.edu/SDG/Software/Mo
84          ROWS NUMBER #REQUIRED -- @#implied? --          ROWS NUMBER #REQUIRED -- @#implied? --
85          COLS NUMBER #REQUIRED          COLS NUMBER #REQUIRED
86          >          >
 ]]>  
87    
 <!-- Obsolete Elements  -->  
88    
 <![ %HTML.litCDATA [ <!ENTITY % lit-content "CDATA"> ]]>  
 <!ENTITY % lit-content "RCDATA">  
 <!ELEMENT (%literal) - -  %lit-content>  
89    
 <![ %HTML.PLAINTEXT [  
 <!ELEMENT PLAINTEXT - O EMPTY>  
 ]]>  
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