メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.0562500 43.5416667, 142.0625000 43.5416667, 142.0625000 43.5458334, 142.0562500 43.5458334, 142.0562500 43.5416667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral