メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.6062500 40.7000000, 140.6125000 40.7000000, 140.6125000 40.7041667, 140.6062500 40.7041667, 140.6062500 40.7000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral