メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2625000 41.9333333, 140.2687500 41.9333333, 140.2687500 41.9375000, 140.2625000 41.9375000, 140.2625000 41.9333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral