メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.375545904484 43.0503161084278, 141.374533442189 43.049451116476, 141.375233499351 43.0490311113716, 141.375645851514 43.0487741809202, 141.376082356465 43.0485043512488, 141.376581091222 43.0489312632996, 141.377097548081 43.0493803215296, 141.375545904484 43.0503161084278)) ^^http://www.opengis.net/ont/geosparql#wktLiteral