Domain is property or a thing like Andrew says and as well in Article: 1.1
- (b) one or more “Domains”, which are things the Role may exclusively control and regulate as its property, on behalf of the Organization.
In Holacracy people are not things, nor a resource. A partner is someone who is available to be assigned to a role. Resources are usually money so I will leave it at that for now. Resources could presumably be other things, so I do get the question; if money is a thing then indeed it could also be a domain, or controlled by a domain (fence).
I am hoping to help clarify both the constitution and the teaching of this going forward. It is a common source of ambiguity.