RE: 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 -----Original Message----- From: ht@c... [mailto:ht@c...] 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.
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