メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0312500 33.6958334, 131.0375000 33.6958334, 131.0375000 33.7000000, 131.0312500 33.7000000, 131.0312500 33.6958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral