メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6312500 33.1458334, 131.6375000 33.1458334, 131.6375000 33.1500000, 131.6312500 33.1500000, 131.6312500 33.1458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral