Version Control

How is version control handled?

Within the Verifiable Claims works[1] ontology is used in a verifiable
claim, which is then signed[2]; yet the question becomes, what happens if
the ontological definition changes?  in theory, this may change the concept
signed as a 'claim' by changing the definition of the URIs involved.?

CONCEPT:  Add version control somehow.

not sure how.

Tim.H.

[1]
https://docs.google.com/presentation/d/1pFGC1G7CbizUuvbmjECfnNRL4fZk9QLxG8d3nehgwNU/edit#slide=id.p

[2] http://json-ld.org/playground/