メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8375000 40.2291667, 140.8437500 40.2291667, 140.8437500 40.2333333, 140.8375000 40.2333333, 140.8375000 40.2291667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral