メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.747428141346 42.9000421883745, 140.746257402968 42.9001322336967, 140.746252724502 42.9000688749383, 140.746178360293 42.8992474178412, 140.747357945002 42.8991823146035, 140.747428141346 42.9000421883745)) ^^http://www.opengis.net/ont/geosparql#wktLiteral