Most of the roles in the Ontology are part of the ePO core module, but if these roles do not appear in any relations of the core module, then they should be moved to a module where such relations exist. The same applies for the rest of the roles and modules.

Note that if a role should be moved to another module, then the role's prefix should reflect this change. For example, if role epo:X that is part of epo core should be moved to eCatalogue then it should become epo-cat:X. The newly moved role should also appear in the "roles" diagram of that module.

An exception to the movement of the roles is that if a role that is part of a module other than core appears in other modules as well, then it should be moved to core, even if it would not appear in any relation in core. For example, if epo-acc:Y that is part of the eAccess module also appears in a relation in the eSubmission module, then it should be moved to epo core.

See ePO's Modular Approach on the Guide to the ePO Modules for more information on modules.