メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7625000 42.6750000, 140.7687500 42.6750000, 140.7687500 42.6791667, 140.7625000 42.6791667, 140.7625000 42.6750000)) ^^http://www.opengis.net/ont/geosparql#wktLiteral