メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.350689946384 44.4789000209436, 142.349748974162 44.4786816853787, 142.350392262024 44.4773412010854, 142.351335785873 44.4775689497805, 142.351037425307 44.4781893765905, 142.350689946384 44.4789000209436)) ^^http://www.opengis.net/ont/geosparql#wktLiteral