メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.350674290105 43.7693290229367, 142.350989863637 43.7698647103008, 142.349432953104 43.7703189477717, 142.349409230346 43.7702764069556, 142.349128280778 43.7697730314104, 142.348841703865 43.7692525369592, 142.35037695944 43.7687903127222, 142.350674290105 43.7693290229367)) ^^http://www.opengis.net/ont/geosparql#wktLiteral