メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5875000 41.0666667, 140.5937500 41.0666667, 140.5937500 41.0708334, 140.5875000 41.0708334, 140.5875000 41.0666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral