メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.0312500 36.9875000, 137.0375000 36.9875000, 137.0375000 36.9916667, 137.0312500 36.9916667, 137.0312500 36.9875000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral