XSLT for payload with namespaces

Question

Hello Experts,      attn:Stefan.
  I am using a XSLT to parse the input xml payload and retrieve the Value of a particular field which will be used for receiver determination.
The XSL code used by me is :
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
<ns1:Receivers xmlns:ns1="http://sap.com/xi/XI/System">
<Receiver>
<Service>
<xsl:value-of select="NemRefusionIndberetningSamling/NemRefusionIndberetningStruktur/HeaderStruktur/ReferenceAttributTekst" />
</Service>
</Receiver>
</ns1:Receivers>
</xsl:template>
</xsl:stylesheet>
And the input payload I am getting is something like:
<?xml version="1.0" encoding="utf-8"?>
<NemRefusionIndberetningSamling >
     <DannetDatoTid>2010-04-22T12:14:28.036+02:00</DannetDatoTid>
     <NemRefusionIndberetningStruktur xmlns="urn:oio:abc:nemrefusionindberetning:2009.07.03" MessageID="1">
          <HeaderStruktur xmlns="urn:oio:abc:nemrefusionheader:2009.07.03">
               <FravaerTypeKode>Sygdom</FravaerTypeKode>
               <FravaerendeStruktur>
                    <FravaerendeTypeKode>Loenmodtager</FravaerendeTypeKode>
                    <LoenUnderFravaerIndikator>false</LoenUnderFravaerIndikator>
               </FravaerendeStruktur>
               <IndberetningUUIDIdentifikator>bf9cc44e-af15-4e19</IndberetningUUIDIdentifikator>
               <ReferenceAttributTekst>S70CLNT007</ReferenceAttributTekst>
          </HeaderStruktur>
     </NemRefusionIndberetningStruktur>
</NemRefusionIndberetningSamling>
The XSLT works fine with above payload. But now we need to add namespaces in top level elements. So the payload will be like:
<NemRefusionIndberetningSamling xmlns="urn:oio:abc:nemrefusionsamling:2009.07.03" UUIDIdentifikator="DF8C1CB43B2E14F1A0C5005">
<DannetDatoTid>2010-04-22T12:14:28.036+02:00</DannetDatoTid>
     <NemRefusionIndberetningStruktur xmlns="urn:oio:abc:nemrefusionindberetning:2009.07.03" MessageID="1">
          <HeaderStruktur xmlns="urn:oio:abc:nemrefusionheader:2009.07.03">
               <FravaerTypeKode>Sygdom</FravaerTypeKode>
               <FravaerendeStruktur>
                    <FravaerendeTypeKode>Loenmodtager</FravaerendeTypeKode>
                    <LoenUnderFravaerIndikator>false</LoenUnderFravaerIndikator>
               </FravaerendeStruktur>
               <IndberetningUUIDIdentifikator>bf9cc44e-af15-4e19</IndberetningUUIDIdentifikator>
               <ReferenceAttributTekst>S70CLNT007</ReferenceAttributTekst>
          </HeaderStruktur>
     </NemRefusionIndberetningStruktur>
</NemRefusionIndberetningSamling>
Top element being changed by addition of namespace, XSLT fails to retriev the value of required field i.e. <ReferenceAttributTekst>
Changed element:
"<NemRefusionIndberetningSamling xmlns="urn:oio:abc:nemrefusionsamling:2009.07.03" UUIDIdentifikator="DF8C1CB43B2E14F1A0C5005">"
I am sure that there should be a way to handle namespaces in XSLT. Please suggest me the correction to XSLT to handle this namespace addition to top element.
Kind Regards,
Abhijeet.

Answer 1

In XSLT you put a prefix before the XPATH rule like this:
p1:root/p2:subnode/element
you declare the namespaces in header as attribute xmlns:p1="..."
Something like:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:p1="..." ...>
In your example you have to consider, that namespaces without prefix are inherited to subnodes. That means you have to build your XPATH like this:
p1:NemRefusionIndberetningSamling/p2:NemRefusionIndberetningStruktur/p3:HeaderStruktur/p3:ReferenceAttributTekst