メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.912612777693 43.5184437586506, 141.91137834117 43.5186205378967, 141.910823974011 43.5168186891047, 141.912174351897 43.516600944038, 141.912478921348 43.516551629906, 141.912536638521 43.5165423059474, 141.912694437588 43.5171199367431, 141.913037766593 43.5183766883497, 141.912612777693 43.5184437586506)) ^^http://www.opengis.net/ont/geosparql#wktLiteral