- Option Trees
  - Midas frameworks allow for easy extension by users.
    - Users can add commands and libraries.
  - Option trees are the mechanism by which users can add functionality without creating conflicts with other users who have added functionality.
    - An option tree is a directory that contains a set of semi-standard subdirectories that is recognized by the Midas framework.
- Path
  - This is the list of option trees currently in use by the Midas framework.
  - The path is configurable at runtime.

Java Experts Take Note:
The Option Tree concept is similar to the package concept in Java. In NeXtMidas, the package names match the option tree structure, with each user's packages beginning "`nxm.<opt>.`".