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Chapter 37. Toward XML > Describing New Vocabularies with XML

Describing New Vocabularies with XML

XML is dual-natured—a meta-language which allows you to describe new document structures and vocabularies as well as the language used to express that structure and vocabulary in a document instance. There is a clear difference between an XML document, which might or might not be associated with a DTD expressed in the XML meta-language, and an XML DTD. They use completely different syntaxes to describe an XML document, the one by example and the other prescriptive.

XML Document Type Definitions (DTDs) describe instances of XML languages, which are sometimes called XML vocabularies. XML documents are created using those languages. Unfortunately, that distinction is sometimes lost in casual speech, and particular XML vocabularies and associated DTDs are described loosely as "XML."


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