メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.740211231088 43.2031427463036, 141.739496942289 43.2038908112677, 141.738908090358 43.2045246556806, 141.738348931525 43.2042333959348, 141.738926750301 43.2036144844778, 141.739642203122 43.2028482838336, 141.740211231088 43.2031427463036)) ^^http://www.opengis.net/ont/geosparql#wktLiteral