whatCanGoHere

[a....@farn-ct.ac.uk]

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[let me know if this question is too dim for this list]
As far as I can make out DTDValidator.whatCanGoHere refers to 
the grammar, rather than the DOM. A method that generates an 
array (etc) of valid children that can be *added* in a (possibly 
incomplete) DOM would be quite handy for XML-generating user 
tools. Likewise whether an element could be removed without 
invalidating the document. Similarly for finding out possible 
attributes that can be *addded* (both names and enumerated 
values).

Anyone got the time to put me straight: can this be done already or 
am I irredemably up a gum tree or just plain confused?