メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((131.8937500 34.4041667, 131.9000000 34.4041667, 131.9000000 34.4083333, 131.8937500 34.4083333, 131.8937500 34.4041667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral