メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.8687500 34.0125000, 131.8750000 34.0125000, 131.8750000 34.0166667, 131.8687500 34.0166667, 131.8687500 34.0125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral