メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.425629067298 43.767988553273, 142.425532080093 43.7669709273189, 142.426205699279 43.7669334937761, 142.426320686519 43.7679713977773, 142.425629067298 43.767988553273)) ^^http://www.opengis.net/ont/geosparql#wktLiteral