SGML Declaration of HTML 4 - HTML 4

20. SGML Declaration of HTML4

Note. The total number of codepointsallowed in the document character set of this SGML declaration includes thefirst 17 planes of [ISO10646] (17 times 65536). This limitation has been madebecause this number is limited to a length of 8 digits in the current versionof the SGML standard. It does not imply any statement about the feasibility ofa long-term restriction of characters in UCS to the first 17 planes. Chancesare very high that the limitation to 8 digits in SGML will be removed before,and that this specification will be updated before, the first assignment of acharacter beyond the first 17 planes.

Note. Strictly speaking, ISO Registration Number 177refers to the original state of [ISO10646] in 1993.Changes since 1993 have been the addition of characters and a one-timeoperation reallocating a large number of codepoints for Korean Hangul(Amendment 5). Revisions of the HTML 4 specification may update the referenceto ISO 10646 to include additional changes.

20.1 SGML Declaration

<!SGML  "ISO 8879:1986 (WWW)" -- SGML Declaration for HyperText Markup Language version HTML 4  With support for the first 17 planes of ISO 10646 and increased limits for tag and literal lengths etc. -- CHARSET  BASESET  "ISO Registration Number 177//CHARSET ISO/IEC 10646-1:1993 UCS-4 with implementation level 3//ESC 2/5 2/15 4/6" DESCSET 0   9   UNUSED 9   2   9 11  2   UNUSED 13  1   13 14  18  UNUSED 32  95  32 127 1   UNUSED 128 32  UNUSED 160 55136   160 55296   2048 UNUSED  -- SURROGATES -- 57344   1056768 57344CAPACITY SGMLREF TOTALCAP 150000 GRPCAP  150000 ENTCAP  150000SCOPE DOCUMENTSYNTAX 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 646IRV:1991//CHARSET   International Reference Version   (IRV)//ESC 2/8 4/2" 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  HCRO "&#38;#x" -- 38 is the number for ampersand --  SHORTREF SGMLREF NAMES SGMLREF QUANTITY SGMLREF  ATTCNT   60  -- increased --  ATTSPLEN 65536   -- These are the largest values --  LITLEN   65536   -- permitted in the declaration --  NAMELEN  65536   -- Avoid fixed limits in actual --  PILEN 65536   -- implementations of HTML UA's --  TAGLVL   100  TAGLEN   65536  GRPGTCNT 150  GRPCNT   64FEATURES  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>