Re: Conditional document merge

 If things subsequently change the order of any missing
 elements has to be based on some default; in this case, after the closest
 element that was known at the time document B was created. 

I didn't understand this, you said doc a was essentially unordered,
I can understand going through doc b and producing the output, you
describe but the only way I understand to get all the @required elements
from doc a that are not in b is to put them all at the end.

If you go the document B you don't know until the end that any required 
elements are not listed do you?

But you have a notion of closest above and in your original you said
any missing nodes can be substituted immediately following
any previous match. neither of which I understand:-)

In your example required output <d> got out out because it was required, but why
did it come at the end (unless all such come at the end)


David

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