メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.7312500 43.5708334, 143.7375000 43.5708334, 143.7375000 43.5750000, 143.7312500 43.5750000, 143.7312500 43.5708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral