SCE — Move definition of instance elements to PMN

The inclusion of instance elements for modeling and exchange is limited in BPM+ to PMN and PPMN (which is dependent on PMN). It is not currently considered to be a generic enough feature to be included in SCE, since most BPM+ languages do not need it.
Thus, in the interest in creating an MVP SCE, it is suggested here that the instance definition elements be removed in SCE and placed in PMN where it is first needed.
This issue was identified through issue SCE-40, which deals with making SCE backwards compatible to the original BPM+ languages. However, there are other elements besides the SCEIntances package that need to be moved, such as TypedElement.
The proposal for this issue will be layered upon (dependent on) the resolution for SCE-40.