メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.331986342186 43.0634699161442, 141.331946908405 43.0636248864984, 141.331797311986 43.0642133957613, 141.330227380188 43.0640154593305, 141.330378030546 43.0634408144111, 141.330535256689 43.0628432260686, 141.331352633869 43.0629417166647, 141.331721731902 43.0629798468982, 141.332096908035 43.0630349028789, 141.332008658894 43.0633821839861, 141.331986342186 43.0634699161442)) ^^http://www.opengis.net/ont/geosparql#wktLiteral