This is an XML namespace defined in the XForms 1.0 specification, published on 28 August 2001.
Warning. This namespace may change without notice. It is likely that the updated XForms 1.0 specification may use different namespace than this one. For updated information, please refer to the latest version of the XForms 1.0 specification.
For more information about XML, please refer to the Extensible Markup Language (XML) 1.0 specification. For more information about XML namespaces, please refer to the Namespaces in XML specification.