メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2625000 34.2333333, 131.2687500 34.2333333, 131.2687500 34.2375000, 131.2625000 34.2375000, 131.2625000 34.2333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral