I feel that a discussion of ltree is incomplete without discussion of manipulating the tree. e.g. splicing, cutting, moving, deleting branches [1] etc. Also, how ltree uses Gist indexes [2].

Reference: [1] http://patshaughnessy.net/2017/12/14/manipulating-trees-usin... [2] http://patshaughnessy.net/2017/12/15/looking-inside-postgres...