Summary

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XML namespaces allow you to avoid naming collisions when you define elements and attributes using different DTDs or schemas. Namespaces can be defined with prefixes, or you can use default namespaces.

XPointer and XPath enable you to link to specific parts of an XML document. XPath can use patterns to identify sections of an XML document. XPointer allows you to do everything XPath can do, but also extends XPath to allow you to address points in the document and ranges between points. The range may not correspond to any one node. XLink enables you to create links within XML documents. In Chapter 7, we'll discuss an XML schema that enables you to validate data types, use namespaces, and check ranges of values.