メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6312500 32.5958334, 131.6375000 32.5958334, 131.6375000 32.6000000, 131.6312500 32.6000000, 131.6312500 32.5958334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral