メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4312500 40.5666667, 140.4375000 40.5666667, 140.4375000 40.5708334, 140.4312500 40.5708334, 140.4312500 40.5666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral