メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.419713990063 43.7437604778064, 142.419774894117 43.7442712166522, 142.419088691871 43.7443053954793, 142.418448228049 43.7443328769858, 142.418401093849 43.7438386947111, 142.418347138656 43.74335280521, 142.419641751543 43.7432912112788, 142.419713990063 43.7437604778064)) ^^http://www.opengis.net/ont/geosparql#wktLiteral