メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2000000 37.2541667, 140.2062500 37.2541667, 140.2062500 37.2583333, 140.2000000 37.2583333, 140.2000000 37.2541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral