メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.352233114857 43.0632976752168, 141.352972939226 43.0634023639543, 141.352673643885 43.0645880953963, 141.351923491474 43.0644869099459, 141.351122669349 43.0643743504006, 141.351414577951 43.0631972164054, 141.352233114857 43.0632976752168)) ^^http://www.opengis.net/ont/geosparql#wktLiteral