Date: Tue, 30 Nov 93 20:35:21 PST
From: Jeff Suttor                   <JSuttor@Library.UCLA.Edu>
Reply-To: Jeff Suttor               <JSuttor@Library.UCLA.Edu>
To: timbl@info.cern.ch
Cc: Betsy Coles                   <ecl4bh1@MVS.OAC.UCLA.Edu>,
        Jeff Suttor                   <JSuttor@Library.UCLA.Edu>,
        woolley@seattleu.edu, e41494@fep1.rl.gov, piet@cv.hp.com,
        rizk@nuri.unica.fr,
        Pieter Lechner                    <Lechner@MIC.UCLA.Edu>,
        kevinh@pulua.hcc.Hawaii.Edu
Subject: Request for a valid HTML.DTD at CERN 
Status: R

To: Tim Berners-Lee
Cc: cern.www.talk, comp.{infosystems.www, text.sgml}
Re: Request for a valid HTML.DTD at CERN

Tim,

At the recent ACM HyperText '93 in Seattle, WWW was a big topic.  During a 
'Birds of Feather' WWW session, a sub-group broke out to discuss HTML.DTD and 
SGML.  Based on our discussion, we would like to request that the following 
replace the 'invalid' HTML.DTD at CERN.  The HTML.DTD listed below does not 
change nor address any design or structural issues with HTML, it only fixes what
were probably editing errors or simple oversights.  It will not change the 
relationship between any existing HTML documents and HTML.DTD, it only makes 
HTML.DTD valid SGML.  Some of the issues we discussed included:  
 
- WWW/HTML is going to be huge, will define many Internet'ers first experience 
with hypertext, a valid HTML.DTD could be an opportunity to introduce them to
the value of structured information from the start

- in several months, years there will be *large* amounts of HTML data, there are 
undesirable consequences to creating data in the large that is not conforming to 
a valid DTD, a valid DTD would help encourage people to not create future data 
legacies that will be difficult to algorithmically convert to other formats, 
support data reuse, etc.  

- a valid HTML.DTD will allow the use of SGML tools, easier conversion from 
existing SGML data to HTML 

- the SGML aware community is already modifying HTML.DTD locally so they can use
their SGML tools defeating the purpose of a single shared HTML.DTD

If we can answer any questions or provide any more information, please let us 
know!

Thanks!

Kurt Conrad, Pieter Lechner, Antoine Rizk, Jeff Suttor, Pieter van Zee, Jack
Woolley

Jeff Suttor                    Pgmr/Analyst  Library Information Systems
University Research Library    (310)825-1206 Fax:(310)206-4109
405 Hilgard Avenue
Los Angeles, CA  90024-1575    JSuttor@Library.UCLA.Edu


!!!
!!! note, the below only fixes 'editing' errors to the existing HTML.DTD
!!! it does *not* address structural, stylistic or other issues
!!!
!!! summary of changes
!!!
!!! 2 %URL; entity references typos fixed, was space before ';'
!!!
!!! 4 typos in entity declarations for HText & SText, was using invalid comment
!!! markup
!!!
!!! 5 typos in element declaration for Head, was using invalid spacing for 
!!! occurance indicators
!!!
!!! ambiguous content model for DL, removed P as P is already in %SText;
!!!


<!SGML  "ISO 8879:1986"
--
        Document Type Definition for the HyperText Markup Language 
        as used by the World Wide Web application (HTML DTD).

        NOTE: This is a definition of HTML with respect to
        SGML, and assumes an understanding of SGML terms.

        If you find bugs in this DTD or find it does not compile
        under some circumstances please mail www-bug@info.cern.ch
--

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 95 32
               255  1 UNUSED


CAPACITY        SGMLREF
                TOTALCAP        150000
                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 31 127 255
         BASESET  "ISO 646:1983//CHARSET
                   International Reference Version (IRV)//ESC 2/5 4/0"
         DESCSET  0 128 0
         FUNCTION 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  34
                  TAGLVL   100
                  LITLEN   1024
                  GRPGTCNT 150
                  GRPCNT   64                   

FEATURES
  MINIMIZE
    DATATAG  NO
    OMITTAG  NO
    RANK     NO
    SHORTTAG NO
  LINK
    SIMPLE   NO
    IMPLICIT NO
    EXPLICIT NO
  OTHER
    CONCUR   NO
    SUBDOC   NO
    FORMAL   YES
  APPINFO    NONE
>

<!DOCTYPE HTML [
<!-- Jul 1 93 -->
<!--    Regarding clause 6.1, SGML Document:

        [1] SGML document = SGML document entity,
            (SGML subdocument entity |
            SGML text entity | non-SGML data entity)*

        The role of SGML document entity is filled by this DTD,
        followed by the conventional HTML data stream.
-->

<!-- DTD definitions -->

<!ENTITY % heading "H1|H2|H3|H4|H5|H6" >
<!ENTITY % list " UL | OL | DIR | MENU ">
<!ENTITY % literal " XMP | LISTING ">

<!ENTITY % headelement
         " TITLE | NEXTID |ISINDEX" >

<!ENTITY % bodyelement
         "P | HR | %heading |
         %list | DL | ADDRESS | PRE | BLOCKQUOTE
        | %literal">

<!ENTITY % oldstyle "%headelement | %bodyelement | #PCDATA">

<!ENTITY % URL "CDATA"
        -- The term URL means a CDATA attribute
           whose value is a Uniform Resource Locator,
           as defined. (A URN may also be usable here when defined.)
        -->

<!ENTITY % linkattributes
        "NAME NMTOKEN #IMPLIED
        HREF %URL; #IMPLIED
        REL CDATA #IMPLIED -- forward relationship type --
        REV CDATA #IMPLIED -- reversed relationship type
                              to referent data:

                                PARENT CHILD, SIBLING, NEXT, TOP,
                                DEFINITION, UPDATE, ORIGINAL etc. --

        URN CDATA #IMPLIED -- universal resource number --

        TITLE CDATA #IMPLIED -- advisory only --

        METHODS NAMES #IMPLIED -- supported public methods of the object:
                                        TEXTSEARCH, GET, HEAD, ... --

        ">


<!-- Document Element -->

<!ELEMENT HTML O O  (( HEAD | BODY | %oldstyle )*, PLAINTEXT?)>

<!ELEMENT HEAD - -  ( TITLE? & ISINDEX? & NEXTID? & LINK* 
                              & BASE?)>

<!ELEMENT TITLE - -  RCDATA
          -- 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 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 URLS -->
<!ATTLIST BASE

        HREF %URL; #IMPLIED

        >
<!ENTITY % inline "EM | TT | STRONG | B | I | U |
                        CODE | SAMP | KBD | KEY | VAR | DFN | CITE "
        >

<!ELEMENT (%inline;) - - (#PCDATA)>

<!ENTITY % text "#PCDATA | IMG | %inline;">

<!ENTITY % htext "A | %text"     -- Plus links, no structure -->

<!ENTITY % stext                 -- as htext but also nested structure --
                        "P | HR | %list | DL | ADDRESS
                        | PRE | BLOCKQUOTE
                        | %literal | %htext">


<!ELEMENT BODY - -  (%bodyelement|%htext;)*>


<!ELEMENT A     - -  (%text)>
<!ATTLIST A
        %linkattributes;
        >

<!ELEMENT IMG    - O EMPTY --  Embedded image -->
<!ATTLIST IMG
        SRC %URL; #IMPLIED     -- URL of document to embed --
        >


<!ELEMENT P     - O EMPTY -- separates paragraphs -->
<!ELEMENT HR    - O EMPTY -- horizontal rule -->

<!ELEMENT ( %heading )  - -  (%htext;)+>

<!ELEMENT DL    - -  (DT | DD | %stext;)*>
<!--    Content should match ((DT,(%htext;)+)+,(DD,(%stext;)+))
        But mixed content is messy.  -Dan Connolly
  -->
 
<!ELEMENT DT    - O EMPTY>
<!ELEMENT DD    - O EMPTY>

<!ELEMENT (UL|OL) - -  (%htext;|LI|P)+>
<!ELEMENT (DIR|MENU) - -  (%htext;|LI)+>
<!--    Content should match ((LI,(%htext;)+)+)
        But mixed content is messy.
  -->
<!ATTLIST (%list)
        COMPACT NAME #IMPLIED -- COMPACT, etc.--
        >

<!ELEMENT LI    - O EMPTY>

<!ELEMENT BLOCKQUOTE - - (%htext;|P)+
        -- for quoting some other source -->

<!ELEMENT ADDRESS - - (%htext;|P)+>

<!ELEMENT PRE - - (#PCDATA|%inline|A|P)+>
<!ATTLIST PRE
        WIDTH NUMBER #implied
        >

<!-- Mnemonic character entities. -->
<!ENTITY AElig "&#198;"  -- capital AE diphthong (ligature) -->
<!ENTITY Aacute "&#193;" -- capital A, acute accent -->
<!ENTITY Acirc "&#194;"  -- capital A, circumflex accent -->
<!ENTITY Agrave "&#192;" -- capital A, grave accent -->
<!ENTITY Aring "&#197;"  -- capital A, ring -->
<!ENTITY Atilde "&#195;" -- capital A, tilde -->
<!ENTITY Auml "&#196;"   -- capital A, dieresis or umlaut mark -->
<!ENTITY Ccedil "&#199;" -- capital C, cedilla -->
<!ENTITY ETH "&#208;"    -- capital Eth, Icelandic -->
<!ENTITY Eacute "&#201;" -- capital E, acute accent -->
<!ENTITY Ecirc "&#202;"  -- capital E, circumflex accent -->
<!ENTITY Egrave "&#200;" -- capital E, grave accent -->
<!ENTITY Euml "&#203;"   -- capital E, dieresis or umlaut mark -->
<!ENTITY Iacute "&#205;" -- capital I, acute accent -->
<!ENTITY Icirc "&#206;"  -- capital I, circumflex accent -->
<!ENTITY Igrave "&#204;" -- capital I, grave accent -->
<!ENTITY Iuml "&#207;"   -- capital I, dieresis or umlaut mark -->
<!ENTITY Ntilde "&#209;" -- capital N, tilde -->
<!ENTITY Oacute "&#211;" -- capital O, acute accent -->
<!ENTITY Ocirc "&#212;"  -- capital O, circumflex accent -->
<!ENTITY Ograve "&#210;" -- capital O, grave accent -->
<!ENTITY Oslash "&#216;" -- capital O, slash -->
<!ENTITY Otilde "&#213;" -- capital O, tilde -->
<!ENTITY Ouml "&#214;"   -- capital O, dieresis or umlaut mark -->
<!ENTITY THORN "&#222;"  -- capital THORN, Icelandic -->
<!ENTITY Uacute "&#218;" -- capital U, acute accent -->
<!ENTITY Ucirc "&#219;"  -- capital U, circumflex accent -->
<!ENTITY Ugrave "&#217;" -- capital U, grave accent -->
<!ENTITY Uuml "&#220;"   -- capital U, dieresis or umlaut mark -->
<!ENTITY Yacute "&#221;" -- capital Y, acute accent -->
<!ENTITY aacute "&#225;" -- small a, acute accent -->
<!ENTITY acirc "&#226;"  -- small a, circumflex accent -->
<!ENTITY aelig "&#230;"  -- small ae diphthong (ligature) -->
<!ENTITY agrave "&#224;" -- small a, grave accent -->
<!ENTITY amp "&#38;"     -- ampersand -->
<!ENTITY aring "&#229;"  -- small a, ring -->
<!ENTITY atilde "&#227;" -- small a, tilde -->
<!ENTITY auml "&#228;"   -- small a, dieresis or umlaut mark -->
<!ENTITY ccedil "&#231;" -- small c, cedilla -->
<!ENTITY eacute "&#233;" -- small e, acute accent -->
<!ENTITY ecirc "&#234;"  -- small e, circumflex accent -->
<!ENTITY egrave "&#232;" -- small e, grave accent -->
<!ENTITY eth "&#240;"    -- small eth, Icelandic -->
<!ENTITY euml "&#235;"   -- small e, dieresis or umlaut mark -->
<!ENTITY gt "&#62;"      -- greater than -->
<!ENTITY iacute "&#237;" -- small i, acute accent -->
<!ENTITY icirc "&#238;"  -- small i, circumflex accent -->
<!ENTITY igrave "&#236;" -- small i, grave accent -->
<!ENTITY iuml "&#239;"   -- small i, dieresis or umlaut mark -->
<!ENTITY lt "&#60;"      -- less than -->
<!ENTITY nbsp "&#32;"    --  should be NON_BREAKING space -->
<!ENTITY ntilde "&#241;" -- small n, tilde -->
<!ENTITY oacute "&#243;" -- small o, acute accent -->
<!ENTITY ocirc "&#244;"  -- small o, circumflex accent -->
<!ENTITY ograve "&#242;" -- small o, grave accent -->
<!ENTITY oslash "&#248;" -- small o, slash -->
<!ENTITY otilde "&#245;" -- small o, tilde -->
<!ENTITY ouml "&#246;"   -- small o, dieresis or umlaut mark -->
<!ENTITY szlig "&#223;"  -- small sharp s, German (sz ligature) -->
<!ENTITY thorn "&#254;"  -- small thorn, Icelandic -->
<!ENTITY uacute "&#250;" -- small u, acute accent -->
<!ENTITY ucirc "&#251;"  -- small u, circumflex accent -->
<!ENTITY ugrave "&#249;" -- small u, grave accent -->
<!ENTITY uuml "&#252;"   -- small u, dieresis or umlaut mark -->
<!ENTITY yacute "&#253;" -- small y, acute accent -->
<!ENTITY yuml "&#255;"   -- small y, dieresis or umlaut mark -->

<!-- deprecated elements -->

<!ELEMENT (%literal) - -  CDATA>

<!ELEMENT PLAINTEXT - O EMPTY>

<!-- Local Variables: -->
<!-- mode: sgml -->
<!-- compile-command: "sgmls -s -p " -->
<!-- end: -->
]>