メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.9875000 31.5583333, 130.9937500 31.5583333, 130.9937500 31.5625000, 130.9875000 31.5625000, 130.9875000 31.5583333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral