メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.4687500 33.5666667, 131.4750000 33.5666667, 131.4750000 33.5708334, 131.4687500 33.5708334, 131.4687500 33.5666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral