メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.421434674618 43.7612103434962, 142.420782059119 43.7612282032141, 142.420123682748 43.7612629646895, 142.420069829523 43.7607773113911, 142.420033457747 43.7602789766537, 142.420668540789 43.7602484870872, 142.421350227992 43.7602136713315, 142.421434674618 43.7612103434962)) ^^http://www.opengis.net/ont/geosparql#wktLiteral