メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.34479961843 43.0573812552837, 141.344656981766 43.0579431854952, 141.344520169713 43.0585196487773, 141.342956106301 43.0583214427042, 141.343099452815 43.0577190098558, 141.343240025856 43.0571549562672, 141.344424267398 43.0573267313779, 141.34479961843 43.0573812552837)) ^^http://www.opengis.net/ont/geosparql#wktLiteral