メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.8875000 31.4708334, 130.8937500 31.4708334, 130.8937500 31.4750000, 130.8875000 31.4750000, 130.8875000 31.4708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral