Here is a simple example with some in-line explanations:
<wsp:UsingPolicy wsdl:required="true" /> <---WS-RM required
<wsp:Policy wsu:Id="MyPolicy" > <---Declare assertions
<wsrm:InactivityTimeout Milliseconds="300000" /> <--timeout in 5 min
<wsrm:BaseRetransmissionInterval Milliseconds="3000" /> <--- wait 3 secs to retransmit
<wsrm:ExponentialBackoff /> <--- exponential delay (start at 3 secs, up to 5 min)
I consider this more of a guideline than an actual spec (e.g. how to write assertions for reliable messaging).
This has me thinking about vertical applications of policy. Industries (or vertiical standards organizations) could start thinking about assertions they need for their service contracts. This would force service consumers within the same industry to be bound by such policies.
Imagine the possibilities...