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> I would agree with David Carlisle.
> In schema, "optional" doesn't mean ANY of the items you suggest.
Yes, I stand corrected. Despite my best efforts, how quickly and easily I fall into the trap of ascribing meaning to constructs in schemas.
Let me rephrase my question:
Why make one element mandatory
and another optional?
That is, what is it about some information that it is declared mandatory whereas another information is declared optional?
/Roger
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