メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.757415957477 43.1972232999803, 141.757098247967 43.1975348937904, 141.756780856298 43.1978843955059, 141.756728840358 43.197939589717, 141.755832783798 43.1974676932715, 141.756194779638 43.1970825899797, 141.756509748217 43.1967354712287, 141.757415957477 43.1972232999803)) ^^http://www.opengis.net/ont/geosparql#wktLiteral