メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.359677657396 43.0739305646109, 141.360494867497 43.0740341829594, 141.360206566914 43.0751753605842, 141.359166605702 43.0750367416442, 141.358653116261 43.0749664222698, 141.358840310659 43.0742169727467, 141.358938113588 43.0738299358908, 141.359677657396 43.0739305646109)) ^^http://www.opengis.net/ont/geosparql#wktLiteral