メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.926138527249 43.4820193158426, 141.924413571058 43.4822999547115, 141.924384643996 43.4823092262764, 141.922449676941 43.482608648852, 141.922440233644 43.4825735637595, 141.922330273238 43.4821433119273, 141.924245907392 43.4818578660949, 141.926014659629 43.4815842799393, 141.926138527249 43.4820193158426)) ^^http://www.opengis.net/ont/geosparql#wktLiteral