メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.354229258818 43.0521295555341, 141.354079902929 43.0527055129371, 141.352541638675 43.0524890763461, 141.352663115602 43.0519187402755, 141.352797978003 43.0513245963792, 141.354390382558 43.0515354748935, 141.354229258818 43.0521295555341)) ^^http://www.opengis.net/ont/geosparql#wktLiteral