メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.6000000 33.4041667, 131.6062500 33.4041667, 131.6062500 33.4083333, 131.6000000 33.4083333, 131.6000000 33.4041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral