So this popped up on [1]Reddit:

    Extensible Dependencies 'N' Actions (EDNA) for Org Mode tasks

    Edna provides an extensible means of specifying conditions which
    must be fulfilled before a task can be completed and actions to take
    once it is.

    Org Edna runs when either the BLOCKER or TRIGGER properties are set
    on a heading, and when it is changing from a TODO state to a DONE
    state.

    For brevity, we use TODO state to indicate any state in
    org-not-done-keywords, and DONE state to indicate any state in
    org-done-keywords.

  (from nongnu.org: [2]http://www.nongnu.org/org-edna-el/)

  I don't have time to dig into this right now but this looks
  particularly interesting.
    __________________________________________________________________

  My original entry is here: [3]org-edna: Extensible Dependencies 'N'
  Actions (EDNA) for Org Mode tasks. It posted Wed, 20 Dec 2017 07:05:51
  +0000.
  Filed under: emacs,

References

  1. https://www.reddit.com/r/emacs/comments/7kyfgn/org_edna_adding_extensible_dependencies_and/
  2. http://www.nongnu.org/org-edna-el/
  3. https://www.prjorgensen.com/?p=768