メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.0875000 40.5916667, 141.0937500 40.5916667, 141.0937500 40.5958334, 141.0875000 40.5958334, 141.0875000 40.5916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral