SGML Declaration of HTML 4

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. 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). Revisions of the HTML 4 specification may update the reference to ISO 10646 to include additional changes.

20 SGML Declaration of HTML 4

20.1 SGML Declaration