メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.3687500 43.3125000, 144.3750000 43.3125000, 144.3750000 43.3166667, 144.3687500 43.3166667, 144.3687500 43.3125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral