メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.353435336908 43.0646874669662, 141.354282460373 43.0648090934951, 141.353981867968 43.0660061411064, 141.353128242587 43.0658950801772, 141.352371994419 43.0657897716839, 141.352521004682 43.0651819562522, 141.352673643885 43.0645880953963, 141.353435336908 43.0646874669662)) ^^http://www.opengis.net/ont/geosparql#wktLiteral