メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((145.6625000 43.3375000, 145.6687500 43.3375000, 145.6687500 43.3416667, 145.6625000 43.3416667, 145.6625000 43.3375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral