メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.0312500 33.5000000, 131.0375000 33.5000000, 131.0375000 33.5041667, 131.0312500 33.5041667, 131.0312500 33.5000000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral