The specification would conform to pre-existing standards for creating XML vocabularies and well-formed XML documents.

Word processing documents use the XML vocabulary known as WordprocessingML normatively defined by the schema which accompanies the standard.

Spreadsheet documents use the XML vocabulary known as SpreadsheetML normatively defined by the schema which accompanies the standard.

In its second form (2.0), FuseDocs uses an XML vocabulary.

Europass has produced an XML vocabulary to describe the information contained in the CV and Language Passport.

The elements of the RSS vocabulary are not generally reusable in other XML vocabularies.

Application schemas are XML vocabularies defined using GML and which live in an application-defined target namespace.

Versa differs from most other RDF query languages, which are typically based on SQL or specialized XML vocabularies.

An XML instance may contain element or attribute names from more than one XML vocabulary.

XML vocabularies define their own tags, and thus use XML to hold information in a way such that that information can be understood.