<http://community.weltenbastler.net/forum/index.php?thread/12996-eine-stadt-planen-aber-wie/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://community.weltenbastler.net/forum/index.php?thread/12996-eine-stadt-planen-aber-wie/&postID=377848>