メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.771093230025 43.1931654058536, 141.770673249894 43.1936064295909, 141.770373917019 43.1939217902181, 141.770289916437 43.1940251709264, 141.769307380731 43.1935376855783, 141.769588416891 43.1932638847648, 141.770150762456 43.1926806265789, 141.771093230025 43.1931654058536)) ^^http://www.opengis.net/ont/geosparql#wktLiteral