Have you seen the request-response example in the 
qpidc-0.6/examples/request-response directory?  It might cover what you're 
trying to do, especially if you add a message id to the message data.

On Aug 16, 2010, at 2:20 PM, Rob Springer wrote:

> All - We've been using Qpid 0.5 up to this point in our applications, and 
> we're at the point where we can begin evaluating 0.6.  Since it's supposed to 
> be "the future", we've been taking a look at the new messaging API, but we're 
> hung up in one spot - we don't see (or haven't found) a means to acknowledge 
> messages individually and/or out-of-order.
>  Our application is heavily dependent on durable/persistent messages, and 
> while we can guarantee that all messages will be consumed and acknowledged in 
> a timely manner, we can't guarantee that all will be acknowledged strictly in 
> the order in which they were received.  Is there, then, a means to 
> acknowledge individual messages, possibly out-of-order?
> 
> Thanks!
> -rob
> 
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> Apache Qpid - AMQP Messaging Implementation
> Project:      http://qpid.apache.org
> Use/Interact: mailto:[email protected]
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