my $item = $data->{startpunkt}->{rule}->{rule}->{$i};
if ($item->{$i}->{src}->{members}->{reference})  {
		print "Quelle: ", $item->{src}->{members}->{reference}->{Name}, "\n";
}
elsif ($item->{src}->{compound}->{compound}) {
		print "Quelle: ", $item->{src}->{compound}->{compound}->{Name}, "\n";
}
...