メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.417966292818 43.8261975880436, 142.418648457503 43.8267153450098, 142.418753009342 43.8267808867592, 142.416228751323 43.8285890050204, 142.415430983765 43.8280298045673, 142.414512067084 43.8273716226488, 142.417038825446 43.8255607650938, 142.417966292818 43.8261975880436)) ^^http://www.opengis.net/ont/geosparql#wktLiteral