メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.5125000 43.7541667, 143.5187500 43.7541667, 143.5187500 43.7583333, 143.5125000 43.7583333, 143.5125000 43.7541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral