This URI represents the namespace of the XML form submission data
markup language defined in the Web Forms 2.0 specification.

For more information on the syntax of XML form submissions, see the
specification:

   http://www.whatwg.org/specs/web-forms/current-work/#x-www-form-xml

This format can also be used to seed forms, see:

   http://www.whatwg.org/specs/web-forms/current-work/#seeding