メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((135.1375000 34.2916667, 135.1437500 34.2916667, 135.1437500 34.2958334, 135.1375000 34.2958334, 135.1375000 34.2916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral