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Using elements as data rather than metadata - very offensive indeed. ;)
There is no solution for this with W3C Schema, but it can be done with
Schematron.
Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton
Strategy and Technology Consultants to the World
Linda Grimaldi wrote:
>
> I have been out of the XML world for a little while now, but someone just asked me a question and I have to admit, it's going to keep me up tonight if I can't come up with a better solution. And I'm a little rusty, to boot...
>
> The issue is one of data dependency and validation. The goal is to enforce a restriction on pairs of data values- if the data associated with the node <Fruit><Name> is "Apple", then the value of the sibling node <Fruit><Abbrev> must be "APL". Effectively, the goal is to enforce a specific mapping from one enum into another within an XML document. The only way my associate could figure to capture this dependency is as follows:
>
> <xs:complexType name="Fruit">
> <xs:annotation>
> <xs:documentation>Defines the valid values for fruit types</xs:documentation>
> </xs:annotation>
> <xs:choice>
> <xs:element name="APL" type="xs:token" fixed="Apple"/>
> <xs:element name="ORG" type="xs:token" fixed="Orange"/>
> <xs:element name="BAN" type="xs:token" fixed="Banana"/>
> <xs:element name="LEM" type="xs:token" fixed="Lemon"/>
> <xs:element name="GRP" type="xs:token" fixed="Grape"/>
> </xs:choice>
> </xs:complexType>
>
> All in all, this strikes me as a very ugly, even offensive, solution. My initial response was to forget about the validation- it wasn't worth it. Is there a way to preserve the data dependency validation without warping the instance document as the above schema fragment would require?
>
> Thanks,
> Linda
>
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--
Kind Regards,
Joseph Chiusano
Associate
Booz | Allen | Hamilton
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