メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3375000 38.2375000, 140.3437500 38.2375000, 140.3437500 38.2416667, 140.3375000 38.2416667, 140.3375000 38.2375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral