メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.945140656432 42.943639423638, 142.944221150353 42.9441882344757, 142.944188865006 42.9442074889491, 142.943543039801 42.943619142173, 142.943572669426 42.9436021536353, 142.944478667094 42.9430527267389, 142.945072252976 42.9435797756158, 142.945140656432 42.943639423638)) ^^http://www.opengis.net/ont/geosparql#wktLiteral