メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4500000 43.0125000, 144.4562500 43.0125000, 144.4562500 43.0166667, 144.4500000 43.0166667, 144.4500000 43.0125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral