On the same note of ReadonlyREST's tenancies, users and roles can be associated using "permissions" to an unlimited number of spaces.
A space is a virtual container of Jobs and Delivery Interfaces. Users and roles can be associated to a number of spaces via permissions of any access levels between read-only, read-write, or Admin.
Moving resources across spaces
Users that have admin access level to 2 or more spaces can copy resources across between spaces