メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.8625000 32.7458334, 131.8687500 32.7458334, 131.8687500 32.7500000, 131.8625000 32.7500000, 131.8625000 32.7458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral