Problem with root Element

Hi folks!
 
According to the new WD it would be possible to write a standalone XForm
document with all the instance data, model declaration and form
controlls or to embed the XForm elements in XHTML. Well, my question now
is... If I want to write a standalone XForms, which root element do I
have to use, because according to the XForm Schema, there is none.
IS there a standard root element for standalone XForms documents?
 
Thanx a lot,
Roman Huditsch