RE: [xml-dev] ID/IDREF makes XML generation NP-hard

That's neat, Henry, and I don't mean to be mean-spirited, 
but is this a "so, but so what?" kind of thing to know? 

len

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Somewhat surprisingly, it turns out that answering the question, for an
arbitrary XML DTD, "Are there any valid instances of the document type
defined by this DTD?", is an NP-hard problem.