メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.126756407414 42.975653721915, 144.125663086384 42.976922939049, 144.122790611261 42.9754885120679, 144.123793430928 42.9743540071218, 144.124784838295 42.9748311947755, 144.125769848716 42.9753054548218, 144.126756407414 42.975653721915)) ^^http://www.opengis.net/ont/geosparql#wktLiteral