メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((130.7750000 31.2250000, 130.7812500 31.2250000, 130.7812500 31.2291667, 130.7750000 31.2291667, 130.7750000 31.2250000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral