メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.419592441663 43.8237366700827, 142.419028545638 43.8233675212141, 142.417896796195 43.8225407552269, 142.41902764903 43.8217347757875, 142.420356683239 43.8207698282689, 142.422005496022 43.8219823535838, 142.419592441663 43.8237366700827)) ^^http://www.opengis.net/ont/geosparql#wktLiteral