メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2625000 38.2833333, 140.2687500 38.2833333, 140.2687500 38.2875000, 140.2625000 38.2875000, 140.2625000 38.2833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral