メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.2375000 39.6916667, 141.2437500 39.6916667, 141.2437500 39.6958334, 141.2375000 39.6958334, 141.2375000 39.6916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral