メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.1375000 44.4750000, 143.1437500 44.4750000, 143.1437500 44.4791667, 143.1375000 44.4791667, 143.1375000 44.4750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral