メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((134.4375000 34.1416667, 134.4437500 34.1416667, 134.4437500 34.1458334, 134.4375000 34.1458334, 134.4375000 34.1416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral