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   Re: [xml-dev] Schema validation question

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Bob Foster wrote:
> This would be trivial to do in RELAX NG, but why do it? If the value of
> one element is fixed by the name of another, then the value is redundant
> and may be omitted. 

How would you then pass that value on to the next system/process if it
is omitted? The subsequent processing might depend on that value being
there - and you may not be able to (for whatever reason) enhance the
subsequent system/process to "inherently" recognize that value.

Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton
Strategy and Technology Consultants to the World

> Such a thing is only useful for producing error
> messages.
> Bob Foster
> 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
Booz | Allen | Hamilton


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