メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2687500 40.6333333, 141.2750000 40.6333333, 141.2750000 40.6375000, 141.2687500 40.6375000, 141.2687500 40.6333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral