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RE: [xml-dev] What does "optional" mean?

> 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?


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