メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.361999728593 43.8314207899955, 142.360585551618 43.8308033142297, 142.359190922382 43.8301840088878, 142.360352793314 43.82850505749, 142.361597333416 43.828176399664, 142.364015528952 43.829925849992, 142.361999728593 43.8314207899955)) ^^http://www.opengis.net/ont/geosparql#wktLiteral