This is an XML namespace reserved for use with the XHTML+Voice 1.2 specification.

Note. This namespace may change without notice. For updated information, please refer to the latest version of the XHTML+Voice 1.2 specification.

The World Wide Web consortium (W3C) has more information about XML and XML namespaces. Please refer to The Extensible Markup Language (XML) 1.0 and Namespaces in XML specifications.