predicate mixins should inherit mappings?

[sierra-moxon]

From Chris B. :
mixin question: should both a predicate and a predicate mixin have the same exact mapping?
Regulates vs. entity regulates entity have different mappings.
In general, we're not sure that mappings should be inherited, but we need some use cases.

[cbizon]

Regulates and process regulates process both have exact_mapping RO:0002211.