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

use XML::Twig;

my $input_xml = '<?xml version="1.0" encoding="UTF-8"?>
<response>
    <result>
        <u_service_catalog>true</u_service_catalog>
        <u_chg>false</u_chg>
        <virtual>false</virtual>
        <u_inc>false</u_inc>
        <u_ci_id>B</u_ci_id>
    </result>
    <result>
        <u_service_catalog>true</u_service_catalog>
        <u_chg>false</u_chg>
        <virtual>false</virtual>
        <u_inc>false</u_inc>
        <u_ci_id>C</u_ci_id>
    </result>
    <result>
        <u_service_catalog>true</u_service_catalog>
        <u_chg>false</u_chg>
        <virtual>false</virtual>
        <u_inc>false</u_inc>
        <u_ci_id>A</u_ci_id>
    </result>
</response>';

my $field= $ARGV[0] || 'u_ci_id';
my $twig = 'XML::Twig'->new;
$twig->xparse($input_xml);

my $root = $twig->root;
my @records = $root->children;

my @sorted = sort {     $b->first_child( $field)->text
                    cmp $a->first_child( $field)->text
                } @records;

for my $record (@sorted) {
    my @info_tags = $record->children;
    my @data;

    for my $info_tag (@info_tags) {
        push @data, [ $info_tag->name, $info_tag->text ];
    }
    say join ',', map $_->[0] . ': ' . $_->[1], @data;
}
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