 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 can't 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&nbsp;â text and office systems&nbsp;â 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 (iso/iec joint technical committee 1, subcommittee 34&nbsp;â document description and processing languages) : * sgml (i
Data_modeling_languages ISO_standards Markup_languages Technical_communication