メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.395000188346 44.1773295418768, 142.394975703126 44.1773902559927, 142.39366245183 44.1771849468313, 142.393738144657 44.1769328716188, 142.393968662899 44.1761375304308, 142.395297211681 44.1763296690691, 142.395000188346 44.1773295418768)) ^^http://www.opengis.net/ont/geosparql#wktLiteral