メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.5500000 32.3791667, 131.5562500 32.3791667, 131.5562500 32.3833333, 131.5500000 32.3833333, 131.5500000 32.3791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral