メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.899962233615 43.4779968598188, 141.900107171003 43.4785319103646, 141.900253417607 43.4789994176834, 141.900209752459 43.4790060711124, 141.899684150499 43.4790863642096, 141.899373543198 43.4780793842981, 141.899081100777 43.4771298468561, 141.899687601564 43.4770431237754, 141.899962233615 43.4779968598188)) ^^http://www.opengis.net/ont/geosparql#wktLiteral