メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.9312500 43.1125000, 142.9375000 43.1125000, 142.9375000 43.1166667, 142.9312500 43.1166667, 142.9312500 43.1125000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral