メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.640385556247 43.9413330148718, 141.641387398853 43.9421484321831, 141.640393875708 43.9427794622628, 141.639391891093 43.9419687288035, 141.639409034397 43.9419577778176, 141.638378964356 43.9411268277539, 141.639321620014 43.9404922057997, 141.640385556247 43.9413330148718)) ^^http://www.opengis.net/ont/geosparql#wktLiteral