メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.379468564659 43.7673377975779, 142.379808729412 43.7679058077208, 142.378289378711 43.7683346730569, 142.377959181624 43.7677758766203, 142.377923579378 43.7677860594342, 142.37761016123 43.7672274370624, 142.379159802886 43.7667656712108, 142.379468564659 43.7673377975779)) ^^http://www.opengis.net/ont/geosparql#wktLiteral