XML 是基于 Standard Generalized Markup Language（标准通用标记语言，SGML）的，后者由 ISO 8879:1986 [ISO 标准]定义。

XML is based on Standard Generalized Markup Language (SGML), defined in ISO 8879:1986 [ISO Standard].

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DocBook最初是一种用于编写图书和文档的流行的标准通用标记语言(Standard Generalized Markup Language, sgml)格式，尤其针对技术性图书和文档。

DocBook was originally a popular Standard Generalized Markup Language (SGML) format for authoring books and documentation, especially those of a more technical nature.

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作家和技术人员例行公事般地创作出以 SGML（标准通用标记语言）格式表示的大量产品说明书、规章需求和计算机系统文档。

Writers and technicians routinely produce voluminous product specifications, regulatory requirements, and computer system documentation in SGML (Standard Generalized Markup Language) format.

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