Subject: Re: [xsl] How to compare two QName values in an XML Schema? From: Michael Kay <mike@xxxxxxxxxxxx> Date: Fri, 08 Apr 2011 18:35:12 +0100 |
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.
/xs:schema/xs:simpleType[1]/QName(../@targetNamespace, @name) eq /xs:schema/xs:simpleType[2]/xs:restriction/@base
Michael Kay Saxonica
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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