The hierarchy in 699 seems deeper than it really is, because of the small number of roots at the top. It does not really begin to branch out until a couple levels down into the hierarchy. So, it is fairly equivalent to 1000 in terms of depth.
Both CWE-699 and CWE-1000 average more than 1 parent per node. In the case of CWE-699, this is expected due to the large number of categories in use. For the Research view, while mutual exclusivity is a goal, further work is needed.
Taxonomic and Related Properties
Quoting from [Howard], and originating from [Amoroso], taxonomies should have the following properties: