Like SGML before it, XML is a meta-language: it is a syntactic basis for defining further languages.
和原来的SGML一样，XML也是一种元语言，是定义其他语言的语法基础。
2
The XML (eXtensible Markup language) meta-language, despite its short lifetime, is already considered a key technology to the e-business world.
尽管XML(可扩展标记语言)元语言问世不久，但对于电子商务世界，它已经被认为是一项关键性技术。
3
What was needed was a consistent and well-understood pseudo - or meta-language to unify all the different ways of representing and documenting software architectures.