XML is based on StandardGeneralizedMarkupLanguage (SGML), defined in ISO 8879:1986 [ISO Standard].
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。
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More modern markup languages, such as the StandardGeneralizedmarkuplanguage (SGML) and XML, popularized more abstract structural markup such as books, chapters, sections, and so on.
较现代的标记语言，例如Standard Generalized Markup Language (SGML)和XML，则使像书、章、节等这类更为抽象的结构标记更易于为大众理解和接受。
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DocBook was originally a popular StandardGeneralizedMarkupLanguage (SGML) format for authoring books and documentation, especially those of a more technical nature.