メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.974815456846 43.5457028202464, 144.974549645353 43.545527914956, 144.974151790519 43.5452632675693, 144.975361735994 43.5442899569705, 144.975601441609 43.5444391137347, 144.976016308249 43.5447122464775, 144.974815456846 43.5457028202464)) ^^http://www.opengis.net/ont/geosparql#wktLiteral