メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((122.9875000 24.4541667, 122.9937500 24.4541667, 122.9937500 24.4583333, 122.9875000 24.4583333, 122.9875000 24.4541667)) ^^http://www.opengis.net/ont/geosparql#wktLiteral