[xsl] Namespace problem

[Marc Schneider <mschneider@xxxxxxxxx>]

I'm working on a stylesheet to process an XML (WSDL) file where some of the 
attribute are QNames. I need to separate the QName in the namespace URI and 
the local name. I'm having trouble resolving the correct namespace URI.

I have the following template which is producing the wrong value for the 
attribute portType_nspc.

	<xsl:template match="wsdl:operation">
		<xsl:element name="operation">
			<xsl:choose>
				<xsl:when test="contains(parent::node()/@name,':')">
					<xsl:attribute name="portType_nspc">
						<xsl:choose>
							<xsl:when test="contains(parent::node()/@name,':')">
								<xsl:value-of 
select="namespace::*[starts-with(name(),substring-before(parent::node()/@name,':'))]"/>
							</xsl:when>
							<xsl:otherwise>
								<xsl:value-of select="ancestor::*[last()]/@targetNamespace"/>
							</xsl:otherwise>
						</xsl:choose>
					</xsl:attribute>
				</xsl:when>
				<xsl:otherwise>
					<xsl:attribute name="portType_nspc"/>
				</xsl:otherwise>
			</xsl:choose>
		</xsl:element>
	</xsl:template>

when run on the following document

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://schemas.xmlsoap.org/wsdl/"; name="TemperatureService"
	targetNamespace="http://www.xmethods.net/sd/TemperatureService.wsdl";
	xmlns:tns="http://www.xmethods.net/sd/TemperatureService.wsdl";>
	<portType name="tns:TemperaturePortType">
		<operation name="tns:getTemp">
			<input message="tns:getTempRequest"/>
			<output message="tns:getTempResponse"/>
		</operation>
	</portType>
</definitions>

I'm getting

	<operation portType_nspc="http://www.w3.org/XML/1998/namespace"/>

when I expect to get

	<operation 
portType_nspc="http://www.xmethods.net/sd/TemperatureService.wsdl"/>

I've tried it with several different versions of Xalan (both C++ and Java 
versions) and get the same results.

Any ideas as to what is going wrong?

Marc