$|=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 $add = $_[4]->{parameters}{$_[1]->{name}};
if ($add) {
if (ref($_[1]->{_content})) {
push @{$_[1]->{_content}}, @$add
} else {
$_[1]->{_content} = [ $_[1]->{_content}, @$add];
# there were no students in the class, the tag contained only the whitespace
}
}
return $_[0] => $_[1]; # once in_interesting get's to zero, we can print the stuff
},
],
style => 'filter', # the other 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;