---+ Ping Proposal One

To simply send a PingRequest no parameters are needed.
So we can specify it like this:

---+++++ Request
<verbatim>
<request>
   <header>
      ...
   </header>
   <ping PingProposalOne>
</request>
</verbatim>

---+++++ Response

The response should have a status "OK" attached to it or maybe some other value.
<verbatim>
<response>
   <header>
      ...
   </header>
   <pong PingProposalOne>
   <diagnostics>
      ...
   </diagnostics>
</response>
</verbatim>