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Key facts
- Filename extension
- .sgml , .sgm
- Internet media type
- Text/SGML , Application/SGML
- Uniform type identifier uti
- public.xml
- Developed by
- ISO
- Type of format
- Markup language
- Extended from
- GML
- Extended to
- HTML , XML
- Standard
- ISO 8879
via Wikipedia infobox
~24 min read
Encyclopedic overview
The Standard Generalized Markup Language (SGML; ISO 8879:1986) is a standard for defining generalized markup languages for documents. ISO 8879 Annex A.1 states that generalized markup is "based on two postulates":
Declarative: Markup should describe a document's structure and other attributes rather than specify the processing that needs to be performed, because it is less likely to conflict with future developments.
Excerpted from Wikipedia’s “Standard Generalized Markup Language” article, available under the CC BY-SA 4.0 licence.