メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.332874648162 43.0417390354168, 141.332802369224 43.042368681787, 141.331095777073 43.0422554737762, 141.331177719214 43.0416218975966, 141.331235860642 43.0411439811058, 141.332932758535 43.0412558423526, 141.332874648162 43.0417390354168)) ^^http://www.opengis.net/ont/geosparql#wktLiteral