メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7062500 38.0916667, 140.7125000 38.0916667, 140.7125000 38.0958334, 140.7062500 38.0958334, 140.7062500 38.0916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral