メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.270986002711 44.0211912096385, 144.269430205726 44.0210482556621, 144.26952254931 44.0204792971495, 144.271087321752 44.0206344924019, 144.270986002711 44.0211912096385)) ^^http://www.opengis.net/ont/geosparql#wktLiteral