メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8562500 41.8833333, 140.8625000 41.8833333, 140.8625000 41.8875000, 140.8562500 41.8875000, 140.8562500 41.8833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral