メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.646703995949 42.8239330890285, 141.646100037736 42.8244294074955, 141.645542498919 42.8248678022265, 141.644519193167 42.8242262990653, 141.645109832757 42.8237739465924, 141.645741406971 42.8232821397524, 141.646703995949 42.8239330890285)) ^^http://www.opengis.net/ont/geosparql#wktLiteral