Files relations toward other entities then Branch in Metamodel

[alkalinan]

It seems that current version only recognize a relation between a File and a Branch

see generator code here.

However, in Gitlab and Github API, a file seems to be link to any Ref: a Branch, a Tag, and a Commit.

ref string
The name of the commit/branch/tag. Default: the repository’s default branch.

Should we update the metamodel ?