メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.3125000 43.0708334, 144.3187500 43.0708334, 144.3187500 43.0750000, 144.3125000 43.0750000, 144.3125000 43.0708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral