Juergen Schoenwaelder <j.schoenwael...@jacobs-university.de> wrote:
> On Fri, Apr 06, 2018 at 10:51:48AM +0200, Ladislav Lhotka wrote:
> > Juergen Schoenwaelder <j.schoenwael...@jacobs-university.de> writes:
> > 
> > > If we would have a mechanism to deviate an identityref to a subset of
> > > identity values supported by an implementation, we would have solved a
> > > more generic problem. Yes, the IANA list could be 'nicer' but it will
> > > never be 'nice'.
> > 
> > Three mechanisms can be used for this:
> > 
> > - splitting the identities into separate modules
> 
> Whatever module organization you come up with, it won't work for all
> implementations. 
> 
> > - using features
> 
> Making every identity a feature will turn the feature system upside
> down. This is similar to making every leaf a feature.
> 
> > - using deviations (even though vendors frown on them)
> 
> If my implementation only supports A and B and C, then a deviation may
> state exactly that and the problem is solved. Hoping that my specific
> combination of A and B and C matches a set of modules or some set of
> features is in my view an illusion.
> 
> Vendors not shipping proper deviations are essentially telling their
> customers that they have not yet understood model driven management.
> We need to change the mindset here instead of polluting our data
> models with hundreds or thousands of fine grained 'features'.

One problem is that you can't "deviate-away" support for an identity.


/martin



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