>  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
IDREF...

The paper does talk about constraints on the contents of a single XML
file if I remember correctly.

Christian



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