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my $xc = XML::LibXML::XPathContext->new( $doc->documentElement() );
$xc->registerNs( foobar => 'http://tempuri.org/sdnList.xsd' );
my $result = $xc->findvalue( '//foobar:lastName' );

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<camel:sdnList xmlns:camel="http://tempuri.org/sdnList.xsd">
  <camel:sdnEntry>
    <camel:lastName>Hello world!</camel:lastName>
  </camel:sdnEntry>
</camel:sdnList>

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<camel:sdnList xmlns:camel="http://tempuri.org/sdnList.xsd">
  <penguin:sdnEntry xmlns:penguin="http://tempuri.org/sdnList.xsd">
    <camel:lastName>Hello world!</camel:lastName>
  </penguin:sdnEntry>
</camel:sdnList>

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<sdnList xmlns="http://tempuri.org/sdnList.xsd">
  <penguin:sdnEntry xmlns:penguin="http://tempuri.org/sdnList.xsd">
    <lastName>Hello world!</lastName>
  </penguin:sdnEntry>
</sdnList>