メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((144.2312500 43.9708334, 144.2375000 43.9708334, 144.2375000 43.9750000, 144.2312500 43.9750000, 144.2312500 43.9708334)) ^^http://www.opengis.net/ont/geosparql#wktLiteral