メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2625000 32.0041667, 131.2687500 32.0041667, 131.2687500 32.0083333, 131.2625000 32.0083333, 131.2625000 32.0041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral