メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((140.755142976626 42.9029427192505, 140.754330086361 42.9029775276678, 140.752796135236 42.9030515636876, 140.752726379132 42.9022413492488, 140.754256733024 42.9021846385092, 140.755056289832 42.9021468427133, 140.755142976626 42.9029427192505)) ^^http://www.opengis.net/ont/geosparql#wktLiteral