メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.5625000 39.6500000, 140.5687500 39.6500000, 140.5687500 39.6541667, 140.5625000 39.6541667, 140.5625000 39.6500000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral