メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.374959036813 43.1134207200846, 141.373632786173 43.1138342921572, 141.373613142111 43.1138385724731, 141.373850953284 43.113036776956, 141.37396612553 43.1126484748725, 141.375120670675 43.112823340469, 141.374959036813 43.1134207200846)) ^^http://www.opengis.net/ont/geosparql#wktLiteral