メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7375000 42.1125000, 140.7437500 42.1125000, 140.7437500 42.1166667, 140.7375000 42.1166667, 140.7375000 42.1125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral