メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.390747364007 44.1746893928785, 142.390742733419 44.1747036373925, 142.38930155183 44.1744750163018, 142.389159872734 44.1739885971863, 142.389001624719 44.173445292859, 142.390428907778 44.173683918315, 142.391044093732 44.1737867598327, 142.390747364007 44.1746893928785)) ^^http://www.opengis.net/ont/geosparql#wktLiteral