メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.259774861265 44.0266945736375, 144.258327961635 44.0270264340149, 144.257906954224 44.0260743811977, 144.257866508564 44.0259618385826, 144.258533195079 44.0261841540758, 144.259819892475 44.0266371572806, 144.259774861265 44.0266945736375)) ^^http://www.opengis.net/ont/geosparql#wktLiteral