XML XSLT namespaces

Question

I got an xml file with namespace 'tns'. I want to use an xslt without to use 'tns' everywhere, but use a matching template instead with the tns namespace declared once and use that one. I want to match the root tns:cv (xml) to my root cv (xsl) Whats wrong with my xslt, because it displays the xml elements, but not the content in it?

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="multiLanguageToSingle.xslt"?>
<tns:cv xmlns:tns="http://www.i8c.be/CvService/1.0">
    <tns:generalLanguage>nl</tns:generalLanguage>
    <tns:careerPath>
        <tns:current>
            <tns:company language="nl">
                <tns:companyName></tns:companyName>
                <tns:description></tns:description>
            </tns:company>
        </tns:current>
        <tns:former>
            <tns:company language="nl">
                <tns:companyName></tns:companyName>
                <tns:description></tns:description>
            </tns:company>
        </tns:former>
    </tns:careerPath>
    <tns:companyDetails>
        <tns:address>

I want to use an xsl for the above xml (first few lines):

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:tns="http://www.i8c.be/CvService/1.0">
<xsl:output method="xml" omit-xml-declaration="no" indent="yes" />
    <xsl:template match="/">
    <xsl:apply-templates select="/tns:cv" />
  </xsl:template>

<xsl:template match="/tns:cv">
<cv xsi:schemaLocation="http://www.i8c.be/CvService/1.0 cvDataTemplate.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<xsl:variable name="language" select='"nl"'/>
    <careerPath>
        <current>
        <xsl:for-each select="cv/careerPath/current/company[@language=$language]">
            <companyName><xsl:value-of select="companyName"/></companyName>
            <description><xsl:value-of select="description"/></description>
        </xsl:for-each>
        </current>

        <former>
        <xsl:for-each select="cv/careerPath/former/company[@language=$language]">
            <companyName><xsl:value-of select="companyName"/></companyName>
            <description><xsl:value-of select="description"/></description>
        </xsl:for-each>
        </former>
    </careerPath>

Christopher Creutzig · Accepted Answer · 2012-05-09 08:26:36Z

The important thing to realize about namespaces is that the namespace in your XML file is not really the tns thing – that is only a file-local name/abbreviation for the actual namespace, namely, http://www.i8c.be/CvService/1.0. Now, you have chosen the same abbreviation in your xslt file (which makes sense for readability, but is completely optional as far as the tools are concerned). Thus, you cannot expect cv/careerPath/current/company[@language=$language] to match anything, and for two reasons:

There is no careerPath element in the default namespace in your XML file. That would need to be tns:careerPath, and similar for the other components of your XPath string.
You are asking for the match with your topmost tns:cv element already being the context node, by wirtue of being inside an xsl:tenplate match on it. Since that node does not contain a cv child, an XPath starting with cv/ results in the empty node set.

So, remove the cv/ at the beginning of your queries and either

add namespace qualifiers or
change the default namespace in your XSLT file, by putting xmlns="http://www.i8c.be/CvService/1.0" on some sufficiently far out element. (Note that this also affects unqualified element names for your output.)

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