Defines core XML constants and functionality from the XML specifications.

The following core XML standards apply:

• Extensible Markup Language (XML) 1.1
• Extensible Markup Language (XML) 1.0 (Second Edition)
• XML 1.0 Second Edition Specification Errata
• Namespaces in XML 1.1
• Namespaces in XML
• Namespaces in XML Errata