メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3312500 41.1833333, 140.3375000 41.1833333, 140.3375000 41.1875000, 140.3312500 41.1875000, 140.3312500 41.1833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral