メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.897748629883 43.012503893482, 142.896845758515 43.0133079331007, 142.895602167368 43.0125042498814, 142.896469565191 43.0117029503414, 142.896690354231 43.0118335737338, 142.897748629883 43.012503893482)) ^^http://www.opengis.net/ont/geosparql#wktLiteral