メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.0125000 43.0500000, 144.0187500 43.0500000, 144.0187500 43.0541667, 144.0125000 43.0541667, 144.0125000 43.0500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral