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<result xmlns="http://www.test.com/integration/integration">

my $xpc = XML::LibXML::XPathContext->new($doc);
$xpc->registerNs('t', 'http://www.test.com/integration/integration');
foreach my $book_node ($xpc->findnodes('/t:books/t:book') ) {
    say "book name is " .$book_name->findvalue('/t:name');
}