"Hello World" for a Joomla web service?

Question

I'd like to write a small web service in Joomla for a client, but I'm not sure how to get started. Although I'm moderately familiar with Joomla and quite comfortable with web services, I'm a complete stranger to web services in Joomla.

Is there a "hello, world" example that anyone's aware of, or could demonstrate in an answer? Sometimes I've also seen a calculator web service as the "hello, world" example, where you support various operations like Add, Subtract, et cetera.

I'm using the latest Joomla 1.5.

Answer 1

I would recommend James Kennard, Mastering Joomla! 1.5 as a reference-style book.

Chapter 10: APIs and Webservices contains 8 pages about XML-RPC.

For real-live examples, search the Joomla! Extension Directory.