メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.914639476642 43.4989103884106, 141.912866721541 43.4991990977672, 141.912756690589 43.4988055422176, 141.912415975677 43.4975870432054, 141.914159277549 43.4973234304402, 141.914639476642 43.4989103884106)) ^^http://www.opengis.net/ont/geosparql#wktLiteral