giaythuytinh176
New Member
XML:\[code\]<zoo xmlns="http://www.zoo.com" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:schemaLocation="http://www.zoo.com employee.xsd"><area id="1" posizione="nord" nome="scimmie"> <animale> <nome>Gigi</nome> <sesso>Male</sesso> <eta>3</eta> </animale> <animale> <nome>Gigia</nome> <sesso>Female</sesso> <eta>2</eta> </animale></area><area id="2" posizione="nord" nome="giraffe"> <animale> <nome>Giro</nome> <sesso>Male</sesso> <eta>6</eta> </animale> <animale> <nome>Gira</nome> <sesso>Female</sesso> <eta>5</eta> </animale></area></zoo>\[/code\]code:\[code\]my $parser = XML::LibXML->new;my $doc = $parser->parse_file("../xml/animals.xml");my $root = $doc->getDocumentElement();my $new_animal = $doc->createElement("animale");my $name_element = $doc->createElement("nome");$name_element->appendTextNode($name);my $gender_element = $doc->createElement("sesso");$gender_element->appendTextNode($gender);my $age_element = $doc->createElement("eta");$age_element->appendTextNode($age);$new_animal->appendChild($name_element);$new_animal->appendChild($gender_element);$new_animal->appendChild($age_element);my $area_element = $root -> findnodes("//area[\@id=$area]")->get_node(1);$area_element->appendChild($new_animal);\[/code\]$area is the id of an area (usually 1 now that I'm testing)my purpose is to create a new animal and to add it to the proper areabut I have the problem that the istruction\[code\] my $area_element = $root -> findnodes("//area[\@id=$area]")->get_node(1);\[/code\]won't work, because $area_element is undef, because findnodes always returns an empty nodelist (checked printing the size()).I think that the problem is the xpath expression inside findnodes, but I can't understand what's wrong, I use the same expression with another library (XML::XPath) and it's working.What's wrong?