メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.9812500 33.9458334, 131.9875000 33.9458334, 131.9875000 33.9500000, 131.9812500 33.9500000, 131.9812500 33.9458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral