メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.639391891093 43.9419687288035, 141.640393875708 43.9427794622628, 141.63940687539 43.9434082532654, 141.638399062947 43.9425919041649, 141.638418749492 43.9425798230427, 141.637389994628 43.9417678756186, 141.638378964356 43.9411268277539, 141.639409034397 43.9419577778176, 141.639391891093 43.9419687288035)) ^^http://www.opengis.net/ont/geosparql#wktLiteral