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The use of the "|" (union) operator is valid in the xs:field element, as
the contents of this field must be a valid XPath expression (and "|" is
a component of a valid XPath expression).
Kind Regards,
Joe Chiusano
Booz | Allen | Hamilton
Murali Mani wrote:
>
> my broad understanding is:
>
> W3C XML-Schema requires that each field expression return one and exactly
> one value.
>
> If we use | it may not be able to ensure this. I would assume that | is
> not allowed to be part of field..
>
> Hopefully others well versed with the spec well will answer..
>
> regards - murali.
>
> On Tue, 20 May 2003, Bill Riegel wrote:
>
> >
> > Using Xerces 2.4,
> > My intension is to define a unique key from the PickData level. Should
> > Keys are
> > Pick/pickObsNo
> > Pick/DataSrc/id or Pick/DataSrcRef/id
> > Pick/VcPickSurfName/pickSurfName
> >
> >
> > Parser fails; complains my constraint failed. If I have a DataSrc in one
> > Pick and a DataSrcRef in the other.
> >
> > Parser Error: Not enough values specified for <key
> > name="Pick_InHierarchy_Key_Definition"> identity constraint specified for
> > element "PickData".
> >
> >
> > If I have a DataSrc in both Picks, all is ok.
> >
> >
> > Is the "|" an or ?
> > Can I use the "|" in this way.
> >
> >
> > <xs:schema xmlns:targetns=http://www.lgc.com/schema/OpenWorksData/2003
> > <http://www.lgc.com/schema/OpenWorksData/2003> >
> >
> > <xs:element name="PickData" type="PickData_Type" minOccurs="0">
> > <xs:key name="Pick_InHierarchy_Key_Definition">
> > <xs:selector xpath="targetns:Pick"/>
> > <xs:field xpath="targetns:pickObsNo"/>
> > <xs:field
> > xpath="targetns:DataSrc/targetns:id|targetns:DataSrcRef/targetns:id"/>
> > <xs:field
> > xpath="targetns:VcPickSurfName/targetns:pickSurfName"/>
> > </xs:key>
> > </xs:element>
> > </xs:schema
> >
> > instance document
> >
> > <DataSet xmlns=http://www.lgc.com/schema/OpenWorksData/2003
> > <http://www.lgc.com/schema/OpenWorksData/2003> >
> >
> > <PickData>
> > <Pick>
> > <pickObsNo>1</pickObsNo>
> > <DataSrc relationship="pickBy">
> > <id>LGC</id>
> > </DataSrc>
> > <VcPickSurfName relationship="pickName">
> > <pickSurfName>C SAND</pickSurfName>
> > </VcPickSurfName>
> > </Pick>
> > <Pick>
> > <pickObsNo>1</pickObsNo>
> > <DataSrcRef relationship="pickBy">
> > <id>LGC</id>
> > </DataSrcRef>
> > <VcPickSurfName relationship="pickName">
> > <pickSurfName>BASE-POROSITY-C SAND</pickSurfName>
> > </VcPickSurfName>
> > </Pick>
> > </PickData>
> > </DataSet>
> >
> > Bill Riegel
> > LandMark Graphics
> > 713-839-3388
> >
> >
>
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