Standard Generalized Markup Language について

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Standard Generalized Markup Language ：ウィキペディア英語版

Standard Generalized Markup Language

The Standard Generalized Markup Language (SGML; ISO 8879:1986) is for defining generalized markup languages for documents. ISO 8879 Annex A.1 defines generalized markup:

Generalized markup is based on two postulates:
* Markup should be declarative: it should describe a document's structure and other attributes, rather than specify the processing to be performed on it. Declarative markup is less likely to conflict with unforeseen future processing needs and techniques.
* Markup should be rigorous so that the techniques available for processing rigorously-defined objects like programs and databases can be used for processing documents as well.

HTML was theoretically an example of an SGML-based language until HTML 5, which admits that browsers cannot parse it as SGML (for compatibility reasons) and codifies exactly what they must do instead.
DocBook SGML and LinuxDoc are better examples, as they were used almost exclusively with actual SGML tools.
== Standard versions ==

SGML is an ISO standard: "ISO 8879:1986 Information processing – Text and office systems – Standard Generalized Markup Language (SGML)", of which there are three versions:
* Original ''SGML'', which was accepted in October 1986, followed by a minor Technical Corrigendum.
* ''SGML (ENR)'', in 1996, resulted from a Technical Corrigendum to add ''extended naming rules'' allowing arbitrary-language and -script markup.
* ''SGML (ENR+WWW or WebSGML)'', in 1998, resulted from a (Technical Corrigendum ) to better support XML and WWW requirements.
SGML is part of a trio of enabling ISO standards for electronic documents developed by ISO/IEC JTC1/SC34〔(【引用サイトリンク】title=JTC 1/SC 34 – Document Description and Processing Languages )〕 (ISO/IEC Joint Technical Committee 1, Subcommittee 34 – Document description and processing languages) :
* SGML (ISO 8879)—Generalized markup language
*
* SGML was reworked in 1998 into XML, a successful profile of SGML. Full SGML is rarely found or used in new projects.
* DSSSL (ISO/IEC 10179)—Document processing and styling language based on Scheme.
*
* DSSSL was reworked into W3C XSLT and XSL-FO which use an XML syntax. Nowadays, DSSSL is rarely used in new projects apart from Linux documentation.
* HyTime—Generalized hypertext and scheduling.〔(ISO/IEC 10744 ) – (Hytime )〕
*
* HyTime was partially reworked into W3C XLink. HyTime is rarely used in new projects.
SGML is supported by various technical reports, in particular
* ISO/IEC TR 9573 – Information processing – SGML support facilities – Techniques for using SGML
*
* Part 13: Public entity sets for mathematics and science
*
*
* In 2007, the W3C MathML working group agreed to assume the maintenance of these entity sets.

抄文引用元・出典: フリー百科事典『ウィキペディア（Wikipedia）』
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