メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.403054098917 43.7527046799877, 142.403113080679 43.7532030422383, 142.401170689086 43.7533032074147, 142.399117714648 43.7534034643854, 142.399063639528 43.7529294948574, 142.39901670212 43.7524293568072, 142.401089275825 43.7523281098725, 142.403033495602 43.752214530842, 142.403054098917 43.7527046799877)) ^^http://www.opengis.net/ont/geosparql#wktLiteral