メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.34635311744 43.0575856825766, 141.346211295742 43.0581584520777, 141.346075610109 43.0587179779513, 141.344520169713 43.0585196487773, 141.344656981766 43.0579431854952, 141.34479961843 43.0573812552837, 141.34635311744 43.0575856825766)) ^^http://www.opengis.net/ont/geosparql#wktLiteral