メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.85706982755 43.3208189346476, 141.857261660614 43.3214543701473, 141.857652369916 43.3227365183449, 141.856774521984 43.3228741041485, 141.856229509642 43.3209317507432, 141.855898466888 43.3196701295752, 141.856636962635 43.319270662182, 141.85706982755 43.3208189346476)) ^^http://www.opengis.net/ont/geosparql#wktLiteral