メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.1000000 39.8833333, 141.1062500 39.8833333, 141.1062500 39.8875000, 141.1000000 39.8875000, 141.1000000 39.8833333)) ^^http://www.opengis.net/ont/geosparql#wktLiteral