[mdt-uml2.dev] subsets support

[Ed Willink <ed@xxxxxxxxxxxxx>]

Hi

I'm investigating how the Interactive OCL Console in the MDT/OCL project 
might support evaluation of an OCL query involving a UML {subsets} property.

The news://new.eclipse.org:119/h8e4ua$g9a$1@xxxxxxxxxxxxxxxxx thread 
suggests that DerivedSubsetEObjectEList is available but not used.

Searching ecore and uml codegen for 'subsets' suggests that codegen 
support for subsets is limited to provision of an EAnnotation, although 
a ..._ESUBSETS feature may be created seemingly without any associated 
usage.

What is the intended {subsets} support?

There are multiple alternative implementation approaches for {subsets}:
a) implement the {subset} from the superset - space efficient, access 
inefficient
b) implement the superset from the {subset}s - space inefficient, access 
efficient
...

should the user have a convert/codegen option?

    Regards

        Ed Willink