メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.3875000 40.8375000, 140.3937500 40.8375000, 140.3937500 40.8416667, 140.3875000 40.8416667, 140.3875000 40.8375000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral