Appending a Document to another

Hi,

I wonder if there is anybody who can tell
me a simple way to add one or more XML-docs
to another Document ?

i.e. 


Document A = new DocumentImpl();
... filling A up with stuff ...

// now I need to add some docs.
DOMParser dp = new DOMParser();
db.parse(somefile);
Document B = db.getDocument();

i tried
fc = A.getfirstchild();
fc.appendChild(B);
but got an exception wrong doc

or do I have to traverse the 
Document B adding the nodes
one by one? (which seems to be so much fun ;-)

TIA
</anders>


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