メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.7812500 40.8208334, 140.7875000 40.8208334, 140.7875000 40.8250000, 140.7812500 40.8250000, 140.7812500 40.8208334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral