メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.4750000 42.9750000, 144.4812500 42.9750000, 144.4812500 42.9791667, 144.4750000 42.9791667, 144.4750000 42.9750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral