You should use an XForms namespace in HTML and XHTML 1.0.
But hopefully not in XHTML 2.0.
The official namespace for XForms is: http://www.w3.org/2002/xforms
If you want to use XForms in HTML (or XHTML 1.0), you should declare all XForms elements with an XForms namespace.
XForms is expected to be a standard part of XHTML 2.0, eliminating the need for the XForms namespace.
This example uses the XForms namespace:
In the example above we have used the xf: prefix for the XForms namespace, but you are free to call the prefix anything you want.
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