メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.9500000 34.9458334, 138.9562500 34.9458334, 138.9562500 34.9500000, 138.9500000 34.9500000, 138.9500000 34.9458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral