20 SGML Declaration of HTML 4.0
Note. The total number of codepoints allowed in
the document character set of this SGML declaration includes the first
17 planes of [ISO10646] (17 times
65536). This limitation has been made because this number is limited
to a length of 8 digits in the current version of the SGML
standard. It does not imply any statement about the feasibility of a
long-term restriction of characters in UCS to the first 17
planes. Chances are 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 a character beyond the first 17
planes.
Note. Strictly speaking, ISO Registration Number 177 refers to the original state of [ISO10646] in 1993, while in this specification, we always refer to the most up-to-date form of ISO 10646. Changes since 1993 have been the addition of characters and a one-time operation reallocating a large number of codepoints for Korean Hangul (Amendment 5).
20.1 SGML Declaration
<!SGML "ISO 8879:1986"
--
SGML Declaration for HyperText Markup Language version 4.0
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 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 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
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 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
>
