#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

use XML::LibXML::Reader;

my $file = shift;

my $reader = 'XML::LibXML::Reader'->new(location => $file)
    or die "Cannot read $file.\n";
while ($reader->nextElement('signal')) {
    say $reader->getAttribute('id')
        if '3464' eq $reader->getAttribute('sigid');
}