Specifying connectivity to endpoints hosted outside a Service Template is a common requirement since components in services must often connect to other services or other components which are already deployed or offered by a completely different administrative entity at possibly different locations.

The two major variations are:
1) Connection to an endpoint hosted in a component in another TOSCA service. I.e. how to model inter Service Template dependencies loosely
2) Connection to an endpoint outside of TOSCA such as an arbitrary endpoint on the Internet.