メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.1062500 41.7916667, 140.1125000 41.7916667, 140.1125000 41.7958334, 140.1062500 41.7958334, 140.1062500 41.7916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral