メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.904326243973 43.4904190363943, 141.904095289233 43.4904667249931, 141.903908025311 43.4903949899298, 141.9030327255 43.4905504051461, 141.903030100092 43.4905408328617, 141.902926886712 43.489928754573, 141.90412057525 43.4897410700656, 141.904326243973 43.4904190363943)) ^^http://www.opengis.net/ont/geosparql#wktLiteral