mass service discovery

Hello,

Is it possible to ask an ejabberd server (example.com) for the available services it offers, including those services offered by users (john@example.com) or entities (proxy.example.com) ? In other words, is there some way to discover example.com's services and services offered by (john@example.com) and (tom@example.com) with a single service discovery query to example.com ?

Thanks.

Regards,
Salem