メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6062500 33.4166667, 131.6125000 33.4166667, 131.6125000 33.4208334, 131.6062500 33.4208334, 131.6062500 33.4166667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral