Service Discovery 
=================

One important aspect of an Agent Domain is that it's mostly a hub for managing
your trust relationships and services you can access. It's supposed to implement
itself as few things as possible but instead to delegate this to separate services.
This might be the case for an Instant Messaging Service, for an Asset database and
other things.

An Agent Domain provider can of course choose to host some of these services and 
simply point to them. It might be possible then to create some shortcuts in the
case of trust handling as we assume that a user always trusts it's Agent Domain.

In order to hook up all the services an Agent Domain implementation MUST implement
Service Discovery. In OGPA we use `XRDS-Simple <http://xrds-simple.net/core/1.0/>`_ 
for that means.