メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((137.6750000 34.6708334, 137.6812500 34.6708334, 137.6812500 34.6750000, 137.6750000 34.6750000, 137.6750000 34.6708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral