This section describes the XML message communication model - where client and server send and receive XML messages over socket communication connections.
Once we know how to work XML strings and hashes, we can now look at how
XML technology can be used in client and server communication.
The most primitive way of using the XML technology in client and server communication
is to write a client program and a server program that send and receive XML messages
with TCP socket communication over the Internet.
The following diagram illustrates how this model works:
Client System Server System
XML | Internet | XML
Client Prog.<--->TCP|<-------------->|TCP<--->Server Prog.
To learn more about TCP socket communication, see the "Socket Communication"
chapter of this book.
A sample server program and a sample client program are presented in sections below
to show you how to use this communication model.
