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XML Schema language is the W3C's recommended replacement for DTD's (Document Type Definitions).
XML Schemas are written in XML only and so can be parsed like any other XML document.
As they are XML documents the full range of XML technologies can be applied to them, such as the Document Object Model and the Extensible StyleSheet language.
XML Schmas support namespaces, allowing validation of certain parts of the document from another XML document in another namespace.
XML Schmas support a greater number of data types.