Maybe you can use one of the B:: modules. I have only used them a couple of times, but it seems like they do the reflection that you are looking for. You end up in the internals because that's where the structure is.
my $struct =
foo => 3
bar => 'baz'
my $node = B::XPath->fetch_root( \&some_function );
my $node= shift;
my $indent= shift;
foreach my $child ($node->get_children())
print " " for (0..$indent);
It should work perfectly the first time! - toma