メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9937500 39.3791667, 141.0000000 39.3791667, 141.0000000 39.3833333, 140.9937500 39.3833333, 140.9937500 39.3791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral