メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.2375000 34.7833333, 136.2437500 34.7833333, 136.2437500 34.7875000, 136.2375000 34.7875000, 136.2375000 34.7833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral