I am trying to perform a normal query into an XML document where something has been declared about the default namespace. If the xmlns="..." part of the data is removed then this test succeeds. What needs to change in my XPath query //lastName or XML::LibXML parser object so that this query will succeed?

use Test::More tests => 2;
use XML::LibXML ();

{
    my $xml = <<'XML';
<?xml version="1.0" standalone="yes"?>
<sdnList>
  <sdnEntry>
    <lastName>Hello world!</lastName>
  </sdnEntry>
</sdnList>
XML
    my $parser = XML::LibXML->new;
    my $doc    = $parser->parse_string($xml);
    my $result = $doc->findvalue('//lastName');
    is( $result, "Hello world!", "No namespace" );
}
{
    my $xml = <<'XML';
<?xml version="1.0" standalone="yes"?>
<sdnList xmlns="http://tempuri.org/sdnList.xsd">
  <sdnEntry>
    <lastName>Hello world!</lastName>
  </sdnEntry>
</sdnList>
XML
    my $parser = XML::LibXML->new;
    my $doc    = $parser->parse_string($xml);
    my $result = $doc->findvalue('//lastName');
    is( $result, "Hello world!", "Namespace" );
}
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Results

1..2
ok 1 - No namespace
not ok 2 - Namespace
#   Failed test 'Namespace'
#   in sdl2.pl at line 30.
#          got: ''
#     expected: 'Hello world!'
# Looks like you failed 1 test of 2.
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