N-VAR In linguistics, the words and expressions that people use to describe or refer to language can be called metalanguage. 元语言 [技术]
Likewise, XML is a metalanguage because it's a language that describes languages.
类似地，XML是一种元语言，因为它是一种描述语言的语言。
The development of a programming language involves the use of a metalanguage.
开发一种编程语言涉及到使用元语言。
Formal syntactic models for the description of grammar, eg generative grammar, are a type of metalanguage.
正式句法模式描述语法，例如生成语法，是一种元语言。
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