[xsl] Doesn't see elements when using namespaces

I am trying to use a very simple XSLT to convert an XML file into CSV
(Comma Separated Values).  However, I'm having difficulties which seems
to be due to the namespaces.  Using XML Spy 5.4, it never finds any
<CodingNoticesP6P6B> elements to process.  If I remove all the
namespaces and "ns0:" prefixes in the XML and XSL files, then it works
fine.

Here is a simplified XML file:

<?xml version="1.0" encoding="utf-8"?>
<ns0:DPSdata
xmlns:ns0="http://www.govtalk.gov.uk/taxation/DPSwrapper/1";>
  <ns0:DataType>P6</ns0:DataType>
  <CodingNoticesP6P6B
        xmlns="http://www.govtalk.gov.uk/taxation/CodingNoticesP6P6B/2";
        xmlns:gt="http://www.govtalk.gov.uk/CM/core";
        xmlns:gms="http://www.govtalk.gov.uk/CM/gms-xs";
        IssueDate="2005-09-01">
    <Name>Alan Brown</Name>
    <TaxCode>123L</TaxCode>
  </CodingNoticesP6P6B>
  <CodingNoticesP6P6B
        xmlns="http://www.govtalk.gov.uk/taxation/CodingNoticesP6P6B/2";
        xmlns:gt="http://www.govtalk.gov.uk/CM/core";
        xmlns:gms="http://www.govtalk.gov.uk/CM/gms-xs";
        IssueDate="2005-09-01">
    <Name>Julie Green</Name>
    <TaxCode>345L</TaxCode>
  </CodingNoticesP6P6B>
</ns0:DPSdata>


Here is my XSL file:

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
version="1.0"
  xmlns:ns0="http://www.govtalk.gov.uk/taxation/DPSwrapper/1";>
<xsl:output method="text" media-type="text/xml"
omit-xml-declaration="yes" encoding="UTF-8"/>

  <!-- This contains the character used as the end of line delimiter.
-->
  <xsl:variable name="CR" select=" '&#13;' "/>

  <!-- Start at the top level -->
  <xsl:template match="/">
    <xsl:apply-templates select="//ns0:DPSdata"/>
  </xsl:template>

  <!-- The header details -->
  <xsl:template match="ns0:DPSdata">
    <xsl:text>1,</xsl:text>
    <xsl:value-of select="ns0:DataType"/>
    <xsl:value-of select="$CR"/>
    <xsl:apply-templates select="//CodingNoticesP6P6B"/>
  </xsl:template>

  <!--- Process a P6/P6B -->
  <xsl:template match="CodingNoticesP6P6B">
    <xsl:call-template name="ExtractDetails"/>  
  </xsl:template>

  <!-- Extract all the details for the P6/P9 -->
  <xsl:template name="ExtractDetails">
    <xsl:text>2,</xsl:text>
    <xsl:value-of select="@IssueDate"/>
    <xsl:text>,</xsl:text>
    <xsl:value-of select="Name"/>
    <xsl:text>,</xsl:text>
    <xsl:value-of select="TaxCode"/>
    <xsl:value-of select="$CR"/>
  </xsl:template>
        
</xsl:stylesheet>

Can anyone see what I'm doing wrong?

Thanks in anticipation.

Colin Simpson
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