メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5625000 41.0625000, 140.5687500 41.0625000, 140.5687500 41.0666667, 140.5625000 41.0666667, 140.5625000 41.0625000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral