Generating SOAP response with Attachments?!

[jdepaul ()]

I'm being asked to create a Service that will retrieve and send back a binary file (PDF) as an attachment back to the calling client.  

I'm finding plenty of examples on how to deal with attachments in a client code, but can't find an example on how to generate a SOAP response with Attachments - could someone please point me to the right place/example?

I should mention that we are using WebSphere 6.1 with JAX-RPC as run-time.

Thanks much -
James