A role in time describes always: * a particular role R; * a particular agent A holding R; * a particular time interval T in which A holds R (optional); * one or more entities (e.g. a particular bibliographic entity or a specific institution) that defines a context for R held by A. (At least one contextual entity should be specified for a particular role). According to this class, someone's affiliation is a relationship of membership or belonging that the person can have with respect to a particular organization (i.e., an individual of the class `foaf:Organization`). Such an affiliation may be specified in the document with respect to which that agent is an author or contributor. A particular individual of [SCoRO](http://purl.org/spar/scoro), i.e., `scoro:affiliate` (belonging to the class `scoro:OrganizationalRole`) is used to express such an affiliation. The domain of `pro:withRole` is not `foaf:Agent`, but rather a member of the class `pro:RoleInTime`, which itself is the range of the property `pro:holdsRoleInTime`, for which the domain is `foaf:Agent` (i.e., our contributor). role in time :david-shotton a foaf:Person ; pro:holdsRoleInTime :shotton-affiliation-for-my-dataset . :shotton-affiliation-for-my-dataset a pro:RoleInTime ; pro:withRole scoro:affiliate ; pro:relatesToOrganization :university-of-oxford ; pro:relatesToEntity :my-dataset . A particular situation that describe a role an agent may have, that can be restricted to a particular time interval.