I've been wondering if the model we're building (see http://identityhappens.blogspot.com/) applies to both, and I think it does. But of course I'd like to hear your views.

I think the lower layers (an Entity with multiple Contexts) are user-centric. Within a Context, I think Enterprise-centric concerns are addressed. Are there any types of service providers that do not have Enterprise-centric concerns? Any service provider that keeps any records about its users is effectively managing Digital Personas. I think.