A processing-instruction to activate XForms

Hello,

I would like to propose the definition of a processing-instruction to 
associate an XForms document to an XML document.

Of course, there is already the well-known processing-instruction for an 
XSLT stylesheet. But, there is also another one for an XML Schema 
(http://www.w3.org/TR/xml-model/#the-xml-model-processing-instruction).

XSLTForms now implements this one:

<?xml-form type="application/xhtml+xml" href="/myform/" 
instance="/myinstance/"?>

It is already used for the XSLTForms Profiler: the Profiler XML instance 
with such a processing-instruction is, on demand, opened in another 
window. It allows to display the Profiler data with different 
possibilities (filtering, sorting,...) while no data is sent to a server.

I would be happy to have your point of view about this.

Thanks!

-Alain