メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.916564541041 43.5841249845153, 141.916090631023 43.5842472643096, 141.915312574502 43.5832550720707, 141.916296689555 43.5830399488045, 141.918013770778 43.5826217099462, 141.920303113227 43.5820832974231, 141.920334632656 43.582152976644, 141.920771052917 43.5830549059155, 141.919234926828 43.5834427685569, 141.918015556294 43.5837523475286, 141.916564541041 43.5841249845153)) ^^http://www.opengis.net/ont/geosparql#wktLiteral