This is the XUP namespace defined in the W3C Note "XUP - Extensible User Interface Protocol."
Note. This namespace may change without notice. For updated information, please refer to the latest version of the XUP Note.
For more information about XUP, please refer to the XUP Submission request. For more information about XML namespaces, please refer to the W3C Recommendation "Namespaces in XML Specification."