Joined: 24/05/2017 18:40:51
Just an example.
Using the API, I've found out that Bogota (city, id=3688689) has a parent called Bogotá D.C. (id=9609540)
But when I want to see the children of Bogota D.C. (9609540), there is no children with id 3688689 (Bogotá)
I think that it's an error... because they are linked only one way.
The same occurs with other cities
EDIT: Something similar is reported here: http://forum.geonames.org/gforum/posts/list/34245.page