メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.325243696571 43.0710043626333, 141.325137873681 43.0714390553208, 141.325106083446 43.0715691185102, 141.324474503864 43.0714839711941, 141.323559348633 43.0713482048205, 141.32358196739 43.0712285470956, 141.323700544445 43.0707821438317, 141.323831768 43.0702219801408, 141.324255156489 43.0702823066931, 141.32516599804 43.0704041765879, 141.325401164905 43.0704332271221, 141.325243696571 43.0710043626333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral