メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.1625000 33.3041667, 131.1687500 33.3041667, 131.1687500 33.3083333, 131.1625000 33.3083333, 131.1625000 33.3041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral