メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7062500 39.7458334, 140.7125000 39.7458334, 140.7125000 39.7500000, 140.7062500 39.7500000, 140.7062500 39.7458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral