Each message:

• Asks the web service to do something as an XML document.

• Has a single document as a response.

• But that response document could have different content depending on the results.

This application has:

• get event list - asks for the list of events.

• create event - creates event(s).

• delete event - deletes event(s).

• alive - the response to a "ping" message.

• error - notification of an error during the operation.

• ok - notification of success