メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.571010076854 42.9817979542866, 141.571363775404 42.9817377357616, 141.571394150898 42.9818283626978, 141.571527045833 42.9822045810628, 141.571656643178 42.9825758562498, 141.571784525081 42.9829508490181, 141.571417909803 42.9830136653022, 141.570133392184 42.9832256958566, 141.570116549019 42.9832285505159, 141.569409888242 42.9832716176917, 141.569372262836 42.9827438344758, 141.569324431256 42.9820731463951, 141.569992297293 42.9819721778599, 141.571010076854 42.9817979542866)) ^^http://www.opengis.net/ont/geosparql#wktLiteral