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<!-- html.dtd |
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|
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Document Type Definition for the HyperText Markup Language |
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as used by the World Wide Web (HTML DTD). |
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|
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$Id: html.dtd,v 1.14 1994/06/03 20:02:52 connolly Exp $ |
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|
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Author: Daniel W. Connolly <connolly@hal.com> |
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See Also: http://www.hal.com/%7Econnolly/html-spec/HTML.html |
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http://info.cern.ch/hypertext/WWW/MarkUp2/MarkUp.html |
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--> |
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|
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<!ENTITY HTML.Version |
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"-//W3O//DTD WWW HTML 2.0//EN" |
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-- public identifier for "current pracitice" version -- |
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|
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-- Typical usage: |
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|
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<!DOCTYPE HTML PUBLIC "-//W3O//DTD WWW HTML 2.0//EN"> |
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<html> |
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... |
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</html> |
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-- |
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> |
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|
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|
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<!-- Feature Test Entities --> |
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|
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<!-- To use these, write your document like: |
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<!DOCTYPE HTML [ |
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<!ENTITY % HTML.Optional "INCLUDE"> |
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<!ENTITY % html PUBLIC "-//connolly hal.com//DTD WWW HTML 1.8//EN"> |
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%html; |
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]> |
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<TITLE>Here's my doc</TITLE> |
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<p>It uses lots of optional features |
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|
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In practice, if you're using sgmls to validate your docs, |
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you can stick the <!DOCTYPE [...]> in a separate file and |
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validate with: |
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sgmls -s doctype.sgml foo.html |
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--> |
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|
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<!ENTITY % HTML.Level0 "IGNORE"> |
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<!ENTITY % HTML.Obsolete "IGNORE"> |
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<!ENTITY % HTML.Prescriptive "IGNORE"> |
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|
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<![ %HTML.Level0 [ |
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<!ENTITY % HTML.linkRelationships "IGNORE"> |
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<!ENTITY % HTML.linkMethods "IGNORE"> |
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<!ENTITY % HTML.linkRedundantInfo "IGNORE"> |
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<!ENTITY % HTML.forms "IGNORE"> |
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<!ENTITY % HTML.phrase "IGNORE"> |
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<!ENTITY % HTML.NEXTID "IGNORE"> |
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<!-- @# Are the following required for conformance? --> |
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<!-- @# nested lists --> |
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<!-- @# IMG --> |
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<!-- @# headers inside A --> |
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<!-- @# nested phrases, fonts --> |
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]]> |
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|
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<![ %HTML.Obsolete [ |
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<!ENTITY % HTML.titleCDATA "INCLUDE"> |
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<!ENTITY % HTML.litCDATA "INCLUDE"> |
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<!ENTITY % HTML.pSeparator "INCLUDE"> |
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]]> |
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|
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<![ %HTML.Prescriptive [ |
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<!-- |
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This feature test entity prescribes that certain |
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idioms detract from the structural integrity of an |
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HTML document, and are therefore disallowed. |
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--> |
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<!ENTITY % HTML.font-phrase "IGNORE"> |
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<!ENTITY % HTML.anchorNameCDATA "IGNORE"> |
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<!ENTITY % HTML.PLAINTEXT "IGNORE"> |
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<!ENTITY % HTML.bodyBlockOnly "INCLUDE"> |
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]]> |
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|
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<!ENTITY % HTML.phrase "INCLUDE" |
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-- phrase markup, ala TeXinfo: TT, EM, etc. |
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--> |
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|
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<!ENTITY % HTML.bodyBlockOnly "IGNORE" |
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-- only allow block elements in the BODY element |
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This means all paragraphs need to start with a <P> tag. |
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--> |
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|
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<!ENTITY % HTML.pSeparator "IGNORE" |
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-- use P element as paragraph separator, rather that container. |
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--> |
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|
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<!ENTITY % HTML.linkRelationships "INCLUDE" |
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-- Adding markup to links to show the relationship between |
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ends of a link |
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see http://info.cern.ch/hypertext/WWW/MarkUp/Relationships.html |
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--> |
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|
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<!ENTITY % HTML.linkMethods "INCLUDE" |
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-- Adding markup to links to show the methods supported |
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by the referent object |
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see http://info.cern.ch/hypertext/WWW/MarkUp/Elements/A.html |
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--> |
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|
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<!ENTITY % HTML.linkRedundantInfo "INCLUDE" |
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-- Adding markup to links to give redundant information |
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like URN, content type, title... |
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--> |
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|
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<!ENTITY % HTML.anchorNameCDATA "INCLUDE" |
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-- Anchor names should be distinct. SGML parser can validate |
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this if the NAME attribute of the A element is declared as ID. |
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But that restricts the syntax of an anchor name to an SGML name, |
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i.e. a letter followed by letters, numbers, periods and dashes, |
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up to NAMELEN (34) characters long. |
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--> |
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|
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<!ENTITY % HTML.PLAINTEXT "INCLUDE" |
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-- Support for the <PLAINTEXT> tag as a sign of the |
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end of th HTML data stream and the beginning of a stream |
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of text/plain data |
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--> |
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|
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<!ENTITY % HTML.titleCDATA "IGNORE" |
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-- Is the TITLE element #PCDATA, RCDATA, or CDATA content? |
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On Mosaic, it's #PCDATA, but in the linemode browser, |
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it's more like CDATA, but not quite. |
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--> |
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|
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<!ENTITY % HTML.NEXTID "INCLUDE" |
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-- Used by the NeXT implementation to keep track of the |
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next anchor id to use |
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--> |
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|
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<!ENTITY % HTML.font-phrase "INCLUDE" |
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-- allow B, I, TT, U outside PRE, |
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CITE, VAR, etc. inside PRE |
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--> |
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|
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<!ENTITY % HTML.KEY "IGNORE" |
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-- There was once a KEY element, for keyboard keys, menu items, |
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buttons, etc. but it's not supported or widely documented |
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--> |
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|
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<!ENTITY % HTML.U "IGNORE" |
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-- There was also a U element, but since it clashes with |
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the common pracitce of underlining hypertext links, it is |
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not widely supported |
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--> |
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|
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<!ENTITY % HTML.litCDATA "IGNORE" |
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-- treat XMP, LISTING as CDATA, as per linemodeWWW |
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--> |
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|
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<!ENTITY % HTML.forms "INCLUDE" |
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-- Support for forms as per |
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http://www.ncsa.uiuc.edu/SDG/Software/Mosaic/Docs/fill-out-forms/overview.html |
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--> |
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|
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<!-- DTD definitions --> |
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|
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<!ENTITY % heading "H1|H2|H3|H4|H5|H6" > |
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<!ENTITY % list " UL | OL | DIR | MENU "> |
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<!ENTITY % literal " XMP | LISTING "> |
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|
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<!ENTITY % URI "CDATA" |
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-- The term URI means a CDATA attribute |
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whose value is a Uniform Resource Identifier, |
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as defined by |
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"Universal Resource Identifiers" by Tim Berners-Lee |
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aka http://info.cern.ch/hypertext/WWW/Addressing/URL/URI_Overview.html |
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|
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Note that CDATA attributes are limited by the LITLEN |
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capacity (1024 in the current version of html.decl), |
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so that URIs in HTML have a bounded length. |
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|
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--> |
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|
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<!ENTITY % Content-Type "CDATA" |
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-- meaning a MIME content type, as per RFC1521 |
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--> |
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|
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<![ %HTML.anchorNameCDATA [ <!ENTITY % anchor-name "CDATA"> ]]> |
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<!ENTITY % anchor-name "ID"> |
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|
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<![ %HTML.linkRelationships [ <!ENTITY % linkRelAttrs " |
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REL CDATA #IMPLIED -- forward relationship type -- |
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REV CDATA #IMPLIED -- reversed relationship type |
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to referent data: |
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|
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PARENT CHILD, SIBLING, NEXT, TOP, |
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DEFINITION, UPDATE, ORIGINAL etc. -- |
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"> ]]> |
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<!ENTITY % linkRelAttrs ""> |
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|
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<![ %HTML.linkRedundantInfo [ <!ENTITY % linkRedundantAttrs " |
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URN CDATA #IMPLIED -- universal resource number -- |
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|
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TITLE CDATA #IMPLIED -- advisory only -- |
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"> ]]> |
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<!ENTITY % linkRedundantAttrs ""> |
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|
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<![ %HTML.linkMethods [ <!ENTITY % linkMethodAttrs " |
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METHODS NAMES #IMPLIED -- supported public methods of the object: |
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TEXTSEARCH, GET, HEAD, ... -- |
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"> ]]> |
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<!ENTITY % linkMethodAttrs ""> |
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|
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<!ENTITY % linkattributes |
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"NAME %anchor-name #IMPLIED |
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HREF %URI; #IMPLIED |
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%linkRelAttrs; |
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%linkRedundantAttrs; |
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%linkMethodAttrs; |
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"> |
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|
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|
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<!-- Document Element --> |
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|
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|
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<![ %HTML.PLAINTEXT [ <!ENTITY % obsolete-plaintext ", PLAINTEXT?"> ]]> |
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<!ENTITY % obsolete-plaintext ""> |
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|
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<!ENTITY % html-content "HEAD, BODY %obsolete-plaintext;"> |
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<!ELEMENT HTML O O (%html-content)> |
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|
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<![ %HTML.NEXTID [ <!ENTITY % head-content "TITLE? & ISINDEX? & LINK* & BASE? |
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& NEXTID?"> ]]> |
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<!ENTITY % head-content "TITLE & ISINDEX? & LINK* & BASE?"> |
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<!ELEMENT HEAD O O (%head-content)> |
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|
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<![ %HTML.titleCDATA [ <!ENTITY % title-content "CDATA"> ]]> |
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<!ENTITY % title-content "(#PCDATA)"> |
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<!ELEMENT TITLE - - %title-content |
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-- The TITLE element is not considered part of the flow of text. |
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It should be displayed, for example as the page header or |
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window title. |
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--> |
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|
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<!ELEMENT ISINDEX - O EMPTY |
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-- WWW clients should offer the option to perform a search on |
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documents containing ISINDEX. |
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--> |
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|
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<!ELEMENT NEXTID - O EMPTY> |
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<!ATTLIST NEXTID N %anchor-name #REQUIRED |
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-- The number should be a name suitable for use |
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for the ID of a new element. When used, the value |
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has its numeric part incremented. EG Z67 becomes Z68 |
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--> |
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<!ELEMENT LINK - O EMPTY> |
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<!ATTLIST LINK |
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%linkattributes> |
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|
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<!ELEMENT BASE - O EMPTY -- Reference context for URIs --> |
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<!ATTLIST BASE |
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|
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HREF %URI; #REQUIRED |
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|
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> |
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|
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<![ %HTML.KEY [ |
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<!ENTITY % key-emph "| KEY"> |
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]]> |
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<!ENTITY % key-emph ""> |
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|
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<![ %HTML.U [ |
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<!ENTITY % u-font "| U"> |
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]]> |
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<!ENTITY % u-font ""> |
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|
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<!ENTITY % font "TT | B | I %u-font"> |
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<!ENTITY % phrase "EM | STRONG | CODE | SAMP | KBD | VAR | DFN | CITE |
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| STRIKE %key-emph"> |
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|
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|
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<![ %HTML.font-phrase [ |
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<!ENTITY % obsolete-font "| %font"> |
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<!ENTITY % obsolete-phrase "| %phrase"> |
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]]> |
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<!ENTITY % obsolete-font ""> |
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<!ENTITY % obsolete-phrase ""> |
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<![ %HTML.pSeparator [ |
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<!ENTITY % obsolete-p "| P"> |
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]]> |
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<!ENTITY % obsolete-p ""> |
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|
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<!ENTITY % inline "%phrase %obsolete-font"> |
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<!ENTITY % pre-inline "%font %obsolete-phrase %obsolete-p"> |
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|
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<!ENTITY % inline ""> |
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<!ENTITY % pre-inline ""> |
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|
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<!ENTITY % text "#PCDATA | IMG | %inline | BR %obsolete-p"> |
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|
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<!ENTITY % htext "A | %text" -- Plus links, no structure --> |
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|
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<![ %HTML.font-phrase [ <!ENTITY % font-content "(%htext)+"> ]]> |
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<!ENTITY % font-content "#PCDATA"> |
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<!ELEMENT (%font;) - - (%font-content;)> |
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|
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<![ %HTML.phrase [ |
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<!ELEMENT (%phrase;) - - (%htext)+> |
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]]> |
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|
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<!ENTITY % pre "PRE | XMP | LISTING"> |
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|
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<![ %HTML.forms [ <!ENTITY % block-form "| FORM | ISINDEX"> ]]> |
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<!ENTITY % block-form ""> |
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|
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<![ %HTML.pSeparator [ |
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<!ENTITY % obsolete-htext "| %htext"> |
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<!ENTITY % block-p ""> |
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]]> |
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<!ENTITY % obsolete-htext "| A"> |
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<!ENTITY % block-p "| P "> |
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|
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<!ENTITY % block "HR | %list | DL |
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| %pre | BLOCKQUOTE | ADDRESS |
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%block-form %block-p"> |
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|
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|
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<![ %HTML.bodyBlockOnly [ |
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<!ENTITY % current-htext ""> |
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]]> |
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<!ENTITY % current-htext "| %htext"> |
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|
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<!ENTITY % body-content "%heading | %block %current-htext"> |
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<!ELEMENT BODY O O (%body-content)*> |
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|
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|
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<!ELEMENT A - - (%heading|%block|%text)+ -(A) |
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-- @# Technically, this allows silliness like: |
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<H2><A>xyz<H1>h1</H1></A></H2> |
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The right way to do anchors outside of %htext is more like: |
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<as id=z1><H2>lkjlkj</h2><ae start=z1> |
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--> |
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<!ATTLIST A |
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%linkattributes; |
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> |
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|
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<!ELEMENT IMG - O EMPTY -- Embedded image --> |
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<!ATTLIST IMG |
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SRC %URI; #IMPLIED -- URI of document to embed -- |
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ALT CDATA #IMPLIED |
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ALIGN (top|middle|bottom) #IMPLIED |
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ISMAP (ISMAP) #IMPLIED |
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> |
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|
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|
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<![ %HTML.pSeparator [ <!ENTITY % p-content "EMPTY"> ]]> |
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<!ENTITY % p-content "(%htext)+"> |
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<!ELEMENT P - O %p-content> |
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<!ELEMENT HR - O EMPTY -- horizontal rule --> |
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<!ELEMENT BR - O EMPTY -- @# BR -> &br; --> |
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|
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<!ELEMENT ( %heading ) - - (%htext;)+> |
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|
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<!ELEMENT DL - - (DT*, DD?)+> |
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<!ATTLIST DL |
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COMPACT (COMPACT) #IMPLIED> |
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|
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<!ELEMENT DT - O (%htext)+> |
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<!ELEMENT DD - O (%htext|%block)+> |
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|
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<!ELEMENT (%list) - - (LI)+> |
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|
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<!ELEMENT LI - O (%htext|%block)+> |
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|
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<!ELEMENT BLOCKQUOTE - - (%htext|%block)+ -- @# Hmm... -- |
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-- for quoting some other source --> |
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|
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<!ELEMENT ADDRESS - - (%htext;|%block)+> |
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|
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<!ELEMENT PRE - - (#PCDATA|%pre-inline|A)+> |
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<!ATTLIST PRE |
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WIDTH NUMBER #implied |
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> |
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|
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<!-- Mnemonic character entities. --> |
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|
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<!ENTITY % ISOlat1 PUBLIC |
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"ISO 8879:1986//ENTITIES Added Latin 1//EN"> |
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%ISOlat1; |
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|
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<!ENTITY #DEFAULT SDATA "&unkown;" --display the markup--> |
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<!ENTITY amp CDATA "&" -- ampersand --> |
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<!ENTITY gt CDATA ">" -- greater than --> |
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<!ENTITY lt CDATA "<" -- less than --> |
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<!ENTITY quot CDATA """ -- double quote --> |
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|
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<!-- Processing Entities --> |
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|
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<!ENTITY nbsp "<? nonbreaking-space>"> |
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<!-- @# should add entites for processing instructions |
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for line break, centering, etc. --> |
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|
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|
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<!-- Forms --> |
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<![ %HTML.forms [ |
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|
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<!ENTITY % HTTP-Method "(GET | POST)"> |
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<!ELEMENT FORM - - (%body-content)* -(FORM) +(INPUT|SELECT|TEXTAREA)> |
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<!ATTLIST FORM |
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ACTION %URI #REQUIRED |
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METHOD %HTTP-Method #IMPLIED -- @# MAILTO? -- |
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ENCTYPE %Content-Type; #IMPLIED |
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> |
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|
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<!ENTITY % InputType "(TEXT | PASSWORD | CHECKBOX | |
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RADIO | SUBMIT | RESET | |
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IMAGE | HIDDEN )"> |
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<!ELEMENT INPUT - O EMPTY> |
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<!ATTLIST INPUT |
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TYPE %InputType #IMPLIED -- @# defaults to TEXT?? -- |
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NAME CDATA #IMPLIED -- required for all but submit and reset -- |
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VALUE CDATA #IMPLIED |
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SRC %URI #IMPLIED -- for image inputs -- |
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CHECKED (CHECKED) #IMPLIED |
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SIZE CDATA #IMPLIED -- @# should be NUMBERS: delimit with space, not comma -- |
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MAXLENGTH NUMBER #IMPLIED |
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ALIGN (top|middle|bottom|left|center|right) #IMPLIED --@#supported?-- |
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> |
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|
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<!ELEMENT SELECT - - (OPTION+)> |
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<!ATTLIST SELECT |
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NAME CDATA #REQUIRED |
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SIZE NUMBER #IMPLIED |
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MULTIPLE (MULTIPLE) #IMPLIED |
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> |
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|
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<!ELEMENT OPTION - O (#PCDATA)> |
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<!ATTLIST OPTION |
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SELECTED (SELECTED) #IMPLIED |
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VALUE CDATA #IMPLIED |
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> |
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|
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<!ELEMENT TEXTAREA - - (#PCDATA)> |
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<!ATTLIST TEXTAREA |
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NAME CDATA #REQUIRED |
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ROWS NUMBER #REQUIRED -- @#implied? -- |
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COLS NUMBER #REQUIRED |
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> |
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]]> |
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|
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<!-- Obsolete Elements --> |
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|
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<![ %HTML.litCDATA [ <!ENTITY % lit-content "CDATA"> ]]> |
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<!ENTITY % lit-content "RCDATA"> |
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<!ELEMENT (%literal) - - %lit-content> |
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|
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<![ %HTML.PLAINTEXT [ |
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<!ELEMENT PLAINTEXT - O EMPTY> |
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]]> |
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