メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.4625000 41.1791667, 140.4687500 41.1791667, 140.4687500 41.1833333, 140.4625000 41.1833333, 140.4625000 41.1791667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral