メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.0875000 39.5958334, 140.0937500 39.5958334, 140.0937500 39.6000000, 140.0875000 39.6000000, 140.0875000 39.5958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral