メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((139.5437500 36.7833333, 139.5500000 36.7833333, 139.5500000 36.7875000, 139.5437500 36.7875000, 139.5437500 36.7833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral