Re: How to compare two QName values in an XML Schema?

Hi Folks,

Below is an XML Schema, containing two simpleTypes. The second one references the first.

I want an XPath expression that compares the second simpleType's reference to the name of the first simpleType:

     /xs:schema/xs:simpleType[1]/@name
       eq
     /xs:schema/xs:simpleType[2]/xs:restriction/@base

That returns False. I want it to return True.

I figured the reason it's returning False is because it is comparing the string "elev:BostonAreaSurfaceElevation" against the string "EarthSurfaceElevation". Yes?

I want it to do a comparison of QNames, not strings. So I type-cast the values:

     xs:QName(/xs:schema/xs:simpleType[1]/@name)
        eq
     xs:QName(/xs:schema/xs:simpleType[2]/xs:restriction/@base)

But that gave me this error:

Casting from xs:unTypedAtomic to xs:QName can never succeed.

Why?

What's the correct way to do the comparison?

---------------------------------------------------------
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
             targetNamespace="http://www.elevation.org"
             xmlns:elev="http://www.elevation.org"
             elementFormDefault="qualified">

     <xsd:simpleType name= "EarthSurfaceElevation">
         <xsd:restriction base="xsd:integer">
             <xsd:minInclusive value="-1290"/>
             <xsd:maxInclusive value="29035"/>
         </xsd:restriction>
     </xsd:simpleType>

     <xsd:simpleType name= "BostonAreaSurfaceElevation">
         <xsd:restriction base="elev:EarthSurfaceElevation">
             <xsd:minInclusive value="0"/>
             <xsd:maxInclusive value="120"/>
         </xsd:restriction>
     </xsd:simpleType>

</xsd:schema>
---------------------------------------------------------

/Roger

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