$|=1;
use XML::Rules;
$xml = <<'*END*';
<school>
<some>tag</some>
<classes name="Primary">
<student name="Junkman">
<Age>12</Age>
</student>
<student name="Lotman">
<Age>14</Age>
</student>
</classes>
<classes name="Nursery">
<student name="Testman">
<Age>34</Age>
</student>
</classes>
<classes name="SomeClass">
</classes>
<other><tags>with values</tags></other>
</school>
*END*
my $parser = new XML::Rules (
rules => [
_default => 'raw',
classes => sub {
my ($tag, $attrs, $context, $parents, $parser) = @_;
my $add = $parser->{parameters}{$attrs->{name}};
if ($add) {
if (ref($attrs->{_content})) {
push @{$attrs->{_content}}, @$add
} else {
$attrs->{_content} = [ $attrs->{_content}, @$add];
# there were no students in the class, the tag contained only the whitespace
}
}
return $tag => $attrs; # the module will print the branch
},
],
style => 'filter', # the default is : style => 'parser'
);
open my $OUT, '>', 'filter.txt';
$parser->filterstring($xml => $OUT,
{
SomeClass => [
[student => {name => 'Johny', age => {_content => 31}}], "\n",
],
Nursery => [
[student => {name => 'Paul', age => {_content => 36}}], "\n",
[student => {name => 'Martin', age => {_content => 33}}], "\n",
],
}
);
close $OUT;