メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.1375000 34.6708334, 136.1437500 34.6708334, 136.1437500 34.6750000, 136.1375000 34.6750000, 136.1375000 34.6708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral