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<?xml version="1.0" encoding="UTF-8"?>
<instruction_request xmlns="http://www.somedomain.tld/market_reg/admin
+_server/1.0"
...
        </info_request>
    </request>
</instruction_request>

use strict;
use warnings;
...
  . $action_requests->get_node(4)->nodeName() . "\"\n";
print 'To node value is "'
  . $action_requests->get_node(4)->textContent() . "\"\n";

$perl newxmltest.pl
request: action_request: action: instance_information: application_typ
+e: application_name: environment: application_host_ip: application_ho
+st_name: request: action_request: action: instance_information: appli
+cation_type: application_name: environment: application_host_ip: appl
+ication_host_name: request: info_request: action: XML::LibXML::Elemen
+t
...
Use of uninitialized value in concatenation (.) or string at newxmltes
+t.pl line 127.
To literal of action requests is ""
Can't call method "nodeName" on an undefined value at newxmltest.pl li
+ne 129.