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> Thus it seems that they share the same proviso as with Henry's analysis:
> Henry's analysis seems to apply to DTDs with fixed IDs or fixed IDREFs,
> and this paper applies to where there is an outside fixed set of constraints
> such as keys and foreign keys.
Not sure I see the distinction between keys and ID and foreign keys and
The paper does talk about constraints on the contents of a single XML
file if I remember correctly.