メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.398492871852 44.1750868284051, 142.397287629816 44.1748960306799, 142.397637928718 44.1737425122919, 142.398030419881 44.1738049922168, 142.398841038924 44.1739340639368, 142.398492871852 44.1750868284051)) ^^http://www.opengis.net/ont/geosparql#wktLiteral