These two tags describe the same usage:
(12 questions have both tags)
So, it seems reasonable to combine these tags.
- eclipse-emf has (much) more questions it seems that users tend to find this tag more easily
- other eclipse frameworks use this scheme, see eclipse-gmf or eclipse-gef
PS I am not allowed to propose this synonym in the regular way, because I do not have enough (any?) answers in eclipse-emf