メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1375000 35.1166667, 140.1437500 35.1166667, 140.1437500 35.1208334, 140.1375000 35.1208334, 140.1375000 35.1166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral