* contrib/lisp/org-export.el (org-export-define-derived-backend): Add
`:parent' property to derived backend.
(org-export-derived-backend-p): New function.
* testing/lisp/test-org-export.el: Add tests.
This function can be useful in filters implemation. I.e.
(defun my-filter (contents backend info)
(when (memq backend '(e-latex e-beamer some-derived-backend-from-latex))
...))
can be replaced with:
(defun my filter (contents backend info)
(when (org-export-derived-backend-p backend 'e-latex)
...))
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