メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.2500000 33.5458334, 131.2562500 33.5458334, 131.2562500 33.5500000, 131.2500000 33.5500000, 131.2500000 33.5458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral