メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.412109978178 43.8256082429943, 142.412874372415 43.8261808939612, 142.411691718433 43.827051239132, 142.410468382024 43.8279565051201, 142.409652200876 43.8274107274481, 142.408839573967 43.8268032604404, 142.411278902316 43.8250195959367, 142.412109978178 43.8256082429943)) ^^http://www.opengis.net/ont/geosparql#wktLiteral