メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.9437500 38.5083333, 140.9500000 38.5083333, 140.9500000 38.5125000, 140.9437500 38.5125000, 140.9437500 38.5083333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral