メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.881103178589 43.0182619321602, 142.880064981371 43.0176122409562, 142.87999527041 43.0175671207072, 142.880029477268 43.0175381682899, 142.880966578832 43.0167029909375, 142.882027482724 43.0173712571262, 142.882074802478 43.0174010266523, 142.8811547071 43.0182163561737, 142.881103178589 43.0182619321602)) ^^http://www.opengis.net/ont/geosparql#wktLiteral