メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6875000 40.7291667, 140.6937500 40.7291667, 140.6937500 40.7333333, 140.6875000 40.7333333, 140.6875000 40.7291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral