メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.9250000 32.9458334, 131.9312500 32.9458334, 131.9312500 32.9500000, 131.9250000 32.9500000, 131.9250000 32.9458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral