メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.406374283215 43.7520379097951, 142.407073682332 43.7519940469317, 142.407176944656 43.7529794280724, 142.406695937171 43.7532491323277, 142.406479481847 43.7530166256645, 142.406447872479 43.7530090399908, 142.404831902057 43.7531066256689, 142.403113080679 43.7532030422383, 142.403054098917 43.7527046799877, 142.403033495602 43.752214530842, 142.40473333965 43.7521337360126, 142.406374283215 43.7520379097951)) ^^http://www.opengis.net/ont/geosparql#wktLiteral