use XML::LibXML; my $parser = XML::LibXML->new(); my $doc = $parser->parse_file("book_service.xml"); my $xpc = XML::LibXML::XPathContext->new($doc->documentElement()); foreach my $book_node ($xpc->findnodes('/book:bookResource/book:book/book:meta')) { foreach $book_element ('./*/@isbn[@type="epub"]') { print $book_node->findvalue($book_element); } }