OCL21 — Add select/reject/collectNested to Collection

Author: Hubert Baumeister (baumeist@informatik.uni-muenchen.de),
Rolf Hennicker (hennicke@informatik.uni-muenchen.de),
Alexander Knapp (knapp@informatik.uni-muenchen.de)
Description: Add select/reject/collectNested to Collection
Rationale:
The definition of any on Collection (page 6-16f.) uses select on Collection. However, select is not defined for Collection. Similarly, the definition of collect on Collection (page 6-17) uses collectNested on Collection, which is not defined on Collection. We therefore propose to add select and collectNested (and possibly reject) to Collection.

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