メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.39146366423 44.1747953070274, 142.390747364007 44.1746893928785, 142.391044093732 44.1737867598327, 142.391754127776 44.1739018226743, 142.39146366423 44.1747953070274)) ^^http://www.opengis.net/ont/geosparql#wktLiteral