メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.989731212172 43.5656987756627, 144.989512730059 43.5653678937966, 144.989922061106 43.5650158021129, 144.990303739643 43.5652179193187, 144.989731212172 43.5656987756627)) ^^http://www.opengis.net/ont/geosparql#wktLiteral