Bäume können mit Tk::TreeGraph visualisiert werden.
#!perl
use strict;
use warnings;
use utf8;
use Tk;
use Tk::TreeGraph;
my $mw = tkinit(-width=>800,-height => 800);
$mw->packPropagate(0);
my $tg = $mw->Scrolled('TreeGraph')->pack(-expand => 1, -fill => 'both');
my $tree_aref = [
['root', [
['S',[
['NP', ['EN Béatrice']],
['VP', [
'VVFIN ist',
['NP', [
'DET die',
['PP', [
'ADJA schönste',
'NN Frau',
]],
]]
]],
]],
'$ .'],
],
];
$tg->draw_tree_from_ref( $tree_aref );
$mw->MainLoop();
exit(0);