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   Test for an optional XML element in an orchestration...

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Hey all:

Is it possible to test for an optional XML element in
an orchestration? 

If you have an orchestration with a decision, you can
test for various values of elements in an incoming
XML document. You can even test if an element 
is null "not isnull()".

However, how can you test if an optional item exists 
in an incoming document?  If you try to expose the
field ( so you can see it on the data page for example
) it provokes an error as the document 
comes in.

Thanks advanced.

<t.abdur-rahim />
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