メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.902874058988 43.4843374862687, 141.902158340135 43.4844522736839, 141.90185759551 43.484476188091, 141.901365860636 43.4839499698299, 141.901994375165 43.4838539816495, 141.902722575147 43.4837427499299, 141.902874058988 43.4843374862687)) ^^http://www.opengis.net/ont/geosparql#wktLiteral