use strict;
use warnings;
no warnings 'uninitialized';
use XML::Rules;

my $xmlStr = <<XML;
<foo>
    <qp name="foo">
        <q supp="yes">hello</q>
        <q supp="no">bye</q>
        <xr supp="yes">later</xr>
    </qp>
    <qp name="bar">
        <q supp="yes">bye</q>
        <xr supp="no">later</xr>
        <xr supp="no">sometime</xr>
    </qp>
</foo>
XML

my $parser = XML::Rules->new(
	stripspaces => 7,
	rules => {
		'q,xr' => sub {
			return if $_[1]->{supp} eq 'yes' or $_[1]->{info} eq 'yes';
			return '+count' => 1;
		},
		qp => sub {
			printf "Definition '%s' has %d quotations.\n", $_[1]->{name}, $_[1]->{count}+0;
			return '+total' => $_[1]->{count}+0;
		},
		foo => sub { return $_[1]->{total} },
		_default => '',
	},
);

my $total = $parser->parse($xmlStr);
print "The total count is $total\n";