メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3875000 41.2333333, 140.3937500 41.2333333, 140.3937500 41.2375000, 140.3875000 41.2375000, 140.3875000 41.2333333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral