メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.766645188875 43.1748180429356, 141.76665151295 43.1755467461257, 141.766814719452 43.1769884689388, 141.765214979121 43.1761925982044, 141.766645188875 43.1748180429356)) ^^http://www.opengis.net/ont/geosparql#wktLiteral