patches to add attribute/element 'form' support

[Stef Epardaud <st...@lunatech.com>]

Hello,

Here are patches to add support to query the 'form' attribute of element
and attribute declarations.
I'm not sure if these fields should get a getter function, and if yes in
which interface, but if you tell me how you like it I'll do it and
resubmit.
-- 
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