メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((128.7750000 32.6666667, 128.7812500 32.6666667, 128.7812500 32.6708334, 128.7750000 32.6708334, 128.7750000 32.6666667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral