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An application of XML or SGML defines what some people call a markup language, and other people would prefer to refer to as a markup vocabulary or namespace. Since some people prefer to reserve the term markup language for meta-languages like XML and SGML, the following discussion will use the term vocabulary — without, however, intending to obscure the fact that the XML-based applications in question do have rules that go beyond the provision of names and may be captured in whole or in part by syntactic formalisms.
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