メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((138.1062500 34.7708334, 138.1125000 34.7708334, 138.1125000 34.7750000, 138.1062500 34.7750000, 138.1062500 34.7708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral