メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.7875000 34.6750000, 131.7937500 34.6750000, 131.7937500 34.6791667, 131.7875000 34.6791667, 131.7875000 34.6750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral