メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.8562500 43.5791667, 143.8625000 43.5791667, 143.8625000 43.5833333, 143.8562500 43.5833333, 143.8562500 43.5791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral