メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((143.049224287069 42.9042530334745, 143.050000592091 42.9043148548514, 143.049849639879 42.9056395779508, 143.04982017498 42.9058541588806, 143.049030772924 42.9058018520185, 143.048248729043 42.9057377426776, 143.048294653367 42.9054526440075, 143.048489740015 42.9042018873712, 143.049224287069 42.9042530334745)) ^^http://www.opengis.net/ont/geosparql#wktLiteral