メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((136.4812500 36.4708334, 136.4875000 36.4708334, 136.4875000 36.4750000, 136.4812500 36.4750000, 136.4812500 36.4708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral