メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.7812500 34.3708334, 136.7875000 34.3708334, 136.7875000 34.3750000, 136.7812500 34.3750000, 136.7812500 34.3708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral