メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3687500 39.5458334, 140.3750000 39.5458334, 140.3750000 39.5500000, 140.3687500 39.5500000, 140.3687500 39.5458334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral