メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.2312500 39.6916667, 140.2375000 39.6916667, 140.2375000 39.6958334, 140.2312500 39.6958334, 140.2312500 39.6916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral