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20 SGML-classified HTML 4.0

Note. The total number of code elements in the document character set of this SGML ads may include the first 17 levels of [ISO10646] (17 times 65,536). This restriction is imposed because the number in the current standard SGML has a maximum length of 8 digits. This does not mean that the restriction of characters in UCS first 17 levels will remain for a long time. It is very likely that the restriction of 8 digits in SGML will be removed, and this specification will be updated.

Note. Strictly speaking, ISO Registration Number 177 refers to the initial state of [ISO10646] in 1993, while in this specification, we always mean the latest version of ISO 10646. Changes in 1993 included the addition of characters and one-time operation reallocating a large number of codepoints for Korean Hangul (Amendment 5).

20.1 Announcement SGML

 <SGML "ISO 8879: 1986"!
  -
  Hypertext Markup Language SGML Announcement 4.0
 
  With support for the first 17 levels and ISO 10646
  increased length and literal tags, 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 September 2
  February 11 UNUSED
  13 on January 13
  14 18 UNUSED
  32 95 32
  127 1 UNUSED
  128 32 UNUSED
  160 55136 160
  55296 2048 UNUSED - SURROGATES -
  57344 1,056,768 57344

 CAPACITY SGMLREF
  TOTALCAP 150000
  GRPCAP 150000
  ENTCAP 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 646IRV: 1991 // CHARSET
  International Reference Version
  (IRV) // ESC 2/8 4/2 "
  DESCSET 0128 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
  ATTCNT 60 - increased -
  ATTSPLEN 65,536 - the maximum values ​​-
  LITLEN 65536 - permitted in the declaration -
  NAMELEN 65536 - Avoid fixed limits -
  PILEN 65,536 - in the implementation of user agents HTML -
  TAGLVL 100
  TAGLEN 65536
  GRPGTCNT 150
  GRPCNT 64

 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
 >
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