メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.387661062801 42.9874434201492, 144.38687963253 42.9873009214169, 144.386747571343 42.9877356999824, 144.386029573869 42.9874225178659, 144.386259363543 42.9867062875774, 144.387020408698 42.9868412940464, 144.387808256744 42.986981139791, 144.387661062801 42.9874434201492)) ^^http://www.opengis.net/ont/geosparql#wktLiteral