Costello, Roger L. wrote:
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?
I think the constructor
(http://www.w3.org/TR/xquery-operators/#constructor-qname-notation) only
works with a string literal as the argument.
What's the correct way to do the comparison?
With schema-aware processing (using the schema for schemas I guess) you
should be able to compare
data(/xs:schema/xs:simpleType[1]/@name) eq
data(/xs:schema/xs:simpleType[2]/xs:restriction/@base)
Otherwise you could use
resolve-QName(/xs:schema/xs:simpleType[1]/@name,
/xs:schema/xs:simpleType[1]) eq
resolve-QName(/xs:schema/xs:simpleType[2]/xs:restriction/@base,
/xs:schema/xs:simpleType[2]/xs:restriction)
--
Martin Honnen
http://msmvps.com/blogs/martin_honnen/
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