メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.347270227495 44.4813488973886, 142.346152365808 44.4810860334386, 142.346166149102 44.4810570885243, 142.34642736751 44.4805084294938, 142.346909020118 44.4806218560297, 142.346946602374 44.4805487690032, 142.34757786859 44.4807015104677, 142.347270227495 44.4813488973886)) ^^http://www.opengis.net/ont/geosparql#wktLiteral