メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.3375000 34.2250000, 136.3437500 34.2250000, 136.3437500 34.2291667, 136.3375000 34.2291667, 136.3375000 34.2250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral