メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.649132458764 42.8305860778968, 141.648333788122 42.8311626876309, 141.647864565965 42.8304333982067, 141.648803757681 42.8296191730112, 141.649950281795 42.8286662767303, 141.650877451784 42.8292730469028, 141.650372882797 42.8296772076329, 141.649862445109 42.8300651584598, 141.649132458764 42.8305860778968)) ^^http://www.opengis.net/ont/geosparql#wktLiteral