メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5000000 38.7916667, 140.5062500 38.7916667, 140.5062500 38.7958334, 140.5000000 38.7958334, 140.5000000 38.7916667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral