メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3500000 40.1500000, 140.3562500 40.1500000, 140.3562500 40.1541667, 140.3500000 40.1541667, 140.3500000 40.1500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral