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   Re: [xml-dev] W3C Schema: Resistance is Futile, says Don Box

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> A.) I wouldn't call ID and IDREF co-occurrence constraints but instead
> identity constraints of which W3C XML Schema has xs:key, xs:keyref and
> xs:unique

Well, I guess that depends on the definition of co-occurence constraints.
To me a co-occurence constraint is a constraint that is applied between
different components of an XML document. With this definition identity
constraints would be a subset of co-occurence constraints.



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