my $viereck=$svg->group(id => 'gr_viereck');
$viereck->rectangle(id=>'viereck1', 'stroke' => 'red', 'fill'=>'yellow', x=>0, y=>0, width=>50, height=>50);
$viereck->rectangle(id=>'viereck2', 'stroke' => 'blue', 'fill'=>'white', x=>100, y=>100, width=>150, height=>150);