メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0875000 39.4875000, 140.0937500 39.4875000, 140.0937500 39.4916667, 140.0875000 39.4916667, 140.0875000 39.4875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral