Code should be, to a reasonable extend, self-documenting to a proficient programmer with reasonable command of the basic platform/ language. Dependency on libraries/frameworks can either help or hinder this goal.

If the usage of the library is clearly obvious from how the library is used in the program, then the program is still self-documenting.

On the other hand, if the library/framework requires extensive knowledge about it in order to understand its usage, then the code has become NOT self-documenting. If support for the library is ever dropped, you may regret your dependency on its arcane format.