メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((141.757233072718 43.1924096058123, 141.757679178452 43.1926412860334, 141.757300052451 43.1930397516396, 141.757120423208 43.1932287235451, 141.75667074808 43.1930102479785, 141.75614539658 43.1927421449296, 141.756737480289 43.1921704676407, 141.757233072718 43.1924096058123)) ^^http://www.opengis.net/ont/geosparql#wktLiteral