メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.76380447954 43.1936563541639, 141.763092574777 43.1943810104515, 141.762533110667 43.1949596792763, 141.762259488812 43.1944951211916, 141.762148188951 43.1943004705785, 141.761964181722 43.1939901010384, 141.762810691827 43.1931648255154, 141.76332244763 43.1934179331721, 141.76380447954 43.1936563541639)) ^^http://www.opengis.net/ont/geosparql#wktLiteral