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Stations:
The stations exposed/supported by the Ensemble is the intersection of the supported stations of all the IM-Ensembles that also exist in the ensemble station file.
And the stations supported by a specific IM-Ensemble is the intersection of the stations supported by its branches.
I.e. (Stration Station file ∩ (IM-Ensemble-1-Stations ∩ IM-Ensemble-2-Stations ∩ ... ∩ IM-Ensemble-N-Stations) where IM-Ensemble-n-Stations = (Branch-1-Stations ∩ Branch-2-Stations ∩ .... ∩ Branch-n-Stations)
The Branch stations are the union of the supported stations of each IMDB.
I.e. (Branch-1-Stations = Leaf-1-Stations ∪ Leaf-2-Stations ∪ .... ∪ Leaf-n-Stations)