xml - Getting an attribute value using Perl XPath -


i'm trying extract attribute id messaggioutente on xml code:

<?xml version="1.0" encoding="utf-8" ?> <?meta name="generator" content="xml::smart/1.78 perl/5.022001 [mswin32]" ?>  <messaggiutenti schemalocation="messagiutentischema.xsd">   <messaggioutente id="1">     <nome>prova evento</nome>     <email>example@email.com</email>     <sitoweb>www.example.com</sitoweb>     <messaggio>sample</messaggio>   </messaggioutente> </messaggiutenti>

my idea use xml::xpath , xml::xpath::xmlparser in way, i'm getting incorrect result:

my $xp = xml::xpath->new(filename => 'newfile.xml'); $nodeset = $xp->find('//@id');   foreach $node ($nodeset->get_nodelist) {          print xml::xpath::xmlparser::as_string($node);  }

the problem is, i'm trying integer value id, while code extract whole string id = "1".

what's suggestion achieve this? goal getting id number , increase until new unused id next messaggioutente value. code this, due string problem it's not correct.

$id = 1;  $xp = xml::xpath->new(filename => 'newfile.xml'); $nodeset = $xp->find('//@id');   foreach $node ($nodeset->get_nodelist) {          $tempvar = xml::xpath::xmlparser::as_string($node);         if($node eq $id)         {             $id = $id + 1;         }      }

each element of nodeset xml::xpath::node::attribute object has getnodevalue method value of node

the best way next id in sequence find maximum value of id attributes , add 1 it

it's best use xpath expression of //messaggioutente/@id avoid picking id attribute of other element

this code demonstrates. i've addded 2 more elements sample data id values of 2 , 3 show functionality better

use strict; use warnings 'all'; use feature 'say';  use xml::xpath; use list::util 'max';  $xp = xml::xpath->new(ioref => \*data);  $ids = $xp->find('//messaggioutente/@id');  $new_id = 1 + max map { $_->getnodevalue } $ids->get_nodelist;  "new id = $new_id";  __data__ <?xml version="1.0" encoding="utf-8" ?> <?meta name="generator" content="xml::smart/1.78 perl/5.022001 [mswin32]" ?>  <messaggiutenti schemalocation="messagiutentischema.xsd">   <messaggioutente id="1">     <nome>prova evento</nome>     <email>example@email.com</email>     <sitoweb>www.example.com</sitoweb>     <messaggio>sample</messaggio>   </messaggioutente>   <messaggioutente id="2">     <nome>prova evento</nome>     <email>example@email.com</email>     <sitoweb>www.example.com</sitoweb>     <messaggio>sample</messaggio>   </messaggioutente>   <messaggioutente id="3">     <nome>prova evento</nome>     <email>example@email.com</email>     <sitoweb>www.example.com</sitoweb>     <messaggio>sample</messaggio>   </messaggioutente> </messaggiutenti>

output

new id = 4

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