Dario,
may i ask you something...

The Data Adapter is responsible to send all information that can be used by the clients.
For exemple, in a datasource that have prices and other information about all companies in the stockmarket, Data Adapter will check this source, "format" these informations and send it to clients only the subscribed itens. (that can be all itens as in the LS's exemple)
Is that correct?

In my case, diferents clients wants to see diferents itens as i told before. Not in quantity, but in content. The Metadata Adapter is responsible to subscribe the itens that a client wants to see, if i "tell" who is the client or the iten. Otherwise, if nothing is informed, he will subscribe all content sent by Data Adapter.
GetItens method is the one who returns the itens that must be subscribed.
Is that correct?

Thanks...