メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.776390219435 43.1993168934937, 141.775931058181 43.1998524442111, 141.775024419789 43.1993836859853, 141.775756426392 43.198601922695, 141.775880415158 43.1987847963804, 141.776033587698 43.1989915602159, 141.776245203497 43.1992551093181, 141.776390219435 43.1993168934937)) ^^http://www.opengis.net/ont/geosparql#wktLiteral