After doing a bunch of somewhat related work having to do with consent, and working with the word Grantee in the "requesting party" slot, I came to really appreciate it for its brevity, and believe that it could suffice for our model definition purposes.

The definition might turn into something like this. Thoughts?

A {Person} to whom a {Grantor} may grant access to a digital data resource, and who, if granted access, uses a {Client} to achieve that access. In any one case a {Grantee} may be the same as, or different from, the {Grantor} or {Resource Subject}.

Eve Maler
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