メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.370394190018 43.7636035743802, 142.370401798147 43.7636170329948, 142.370695644366 43.7641592533719, 142.369200280485 43.7645887755549, 142.368903781169 43.7640531470097, 142.368590182614 43.7635110835397, 142.370104535283 43.7630911994785, 142.370394190018 43.7636035743802)) ^^http://www.opengis.net/ont/geosparql#wktLiteral