メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.911221773267 43.4990040660023, 141.9111738429 43.4988430168539, 141.91098713489 43.4981331498092, 141.910891144865 43.4978175907091, 141.912415975677 43.4975870432054, 141.912756690589 43.4988055422176, 141.911221773267 43.4990040660023)) ^^http://www.opengis.net/ont/geosparql#wktLiteral