メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.6500000 43.5000000, 144.6562500 43.5000000, 144.6562500 43.5041667, 144.6500000 43.5041667, 144.6500000 43.5000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral