メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.747278869868 42.8983217624668, 140.747357945002 42.8991823146035, 140.746178360293 42.8992474178412, 140.746081377856 42.8983569513479, 140.745923412646 42.8967718700286, 140.747128239987 42.8966970380351, 140.747199761476 42.8976321133676, 140.747278869868 42.8983217624668)) ^^http://www.opengis.net/ont/geosparql#wktLiteral