5.3. Using Service Discovery with Clients

When it comes to discovering the capabilities of other clients on the network, there are two tools at your disposal: explicit service discovery of the kind we’ve already discussed, and a kind of service discovery shorthand that is advertised in XMPP presence notifications. We’ll look at each of these in turn.

5.3.1. Explicit Service Discovery

In the last section, we said that a client always knows about at least one entity: its server. Yet we’ve also seen that usually a client knows about some other entities: the items in its roster. What can those entities do?