メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.753992422814 43.1907842614492, 141.753489079674 43.1905146929787, 141.754607412075 43.1892393541346, 141.754724381863 43.1892750237507, 141.755237752053 43.1894570022096, 141.754671694166 43.190074567442, 141.753992422814 43.1907842614492)) ^^http://www.opengis.net/ont/geosparql#wktLiteral