メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.2562500 36.0041667, 138.2625000 36.0041667, 138.2625000 36.0083333, 138.2562500 36.0083333, 138.2562500 36.0041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral