[ptxdist] What can be actually set in a collection

[Mircea Ciocan <m.ciocan@ppc-ag.de>]

Hello everybody,
in an attempt to consolidate multiple similar platforms under one ptxconfig + individual collection configs we are not sure if in the collection only individual software packages can be set that have been already marked with <m> in the root ptxconfig, or other things, like variables containing a string or different build options for a specific package can be put in a collection.
If these things can't be stored in a collection, can be stored somewhere else so they can be merged with the global ptxdist when a specific configuration is selected ?
Can/will the already define variable be overridden ? Is there any related documentation ?

 Many thanks for your support,
 Mircea