Further Reading on PHP and SOAP technologies:

Interacting with remote services is a broad topic, and there is much more to it than is covered in this chapter. SOAP especially is an evolving standard that is deserving of a book of its own. Here are some additional resources for topics covered in this chapter, broken down by topic.

SOAP
The SOAP specification can be found at http://www.w3.org/TR/SOAP.
An excellent introduction to SOAP can be found at http://vrfw.soapware.org/bdg.
All of Shane Caraveo's Web services talks at http://talks.php.net provide insight into succeeding with SOAP in PHP. Shane is the principal author of the PHP 5 SOAP implementations.

XML-RPC
The XML-RPC specification can be found at http://www.xmlrpc.com/spec.
Dave Winer, author of XML-RPC, has a nice introduction to it at http://davenet. scripting.com/1998/07/14/xmlRpcForNewbies.

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