メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.8937500 32.9958334, 131.9000000 32.9958334, 131.9000000 33.0000000, 131.8937500 33.0000000, 131.8937500 32.9958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral