Beginners Soap question....

Question

Hi, I am just starting to learn about WebServices and I have run into my first big question.... Starting with the Soap Request Message that is sent to the Soap Server, how does the Soap Server know where to look for the implementation of the method that is requested? I dont see , yet, how the Soap Message maps to the execution of the requested method. Can someone explain a little bit of what happens at the Web Service when the Soap Request Message arrives? Thanks in advance.