suppose I have a xml file: class_report.xml: 
<root>
<class name='music'>
        <record type='month' index='0'> # for the students of 1st mont
+h.
                <string>sam1</string>
                <string>sam2</string>
        </record>
        <record type='month' index='1'> # for the students of 2nd mont
+h.
                <string>mike1</string>
                <string>mike2</string>
        </record>
</class>
<class name='english'>
        <record type='week' index='2'> #for the students of 3rd week.
                <string>luke1</string>
                <string>luke2</string>
        </record>
        <record type='month' index='3'> # for the students of 3nd mont
+h.
                <string>ben1</string>
                <string>ben2</string>
        </record>
</class>
</root>

[download]
How to parse the xml so that I can get a string list of class name = english, type = month and index = 3? Here is my code using twig: 
use XML::Twig;

#purpose: get the string of the related $class+$month+index
sub parse_a_counter {
            my ($twig, $class) = @_;
            my $class_name = $class->{'att'}->{'name'};
            my @report = $class->children('report [@type="month"]');
            for my $report (@report){
                my @string_list = $report->children_text('string');
            }
            $class->flush; # free the memory of $counter
}

my $roots = { 'class[@name="english"]' => 1 };
my $handlers = { class => \&parse_a_counter };
my $twig = new XML::Twig(TwigRoots => $roots,
                         TwigHandlers => $handlers);
$twig->parsefile('class_report.xml');

[download]

20100713 Janitored by Corion: Added formatting, code tags, as per Writeup Formatting Tips

In reply to how to write this condition in XML:TWIG by lilili07

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