メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.8687500 40.8916667, 140.8750000 40.8916667, 140.8750000 40.8958334, 140.8687500 40.8958334, 140.8687500 40.8916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral