メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2875000 37.4708334, 140.2937500 37.4708334, 140.2937500 37.4750000, 140.2875000 37.4750000, 140.2875000 37.4708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral