Some developers may have noticed that Joomla 1.6 has removed the /xmlrpc directory, and the phpxmlrpc library from the core Joomla installation. There are certainly good reasons for this -- the directory did not conform to any standards in Joomla, and could potentially expose a security hole for a site in some rare circumstances.We've been developing and experimenting with XML-RPC in our projects, and have come to a simple solution to the lack of XML-RPC support in 1.6 by creating a library extension. Libraries are a new kind of extension in 1.6, designed to allow different components, plugins, and different developers share the same code libraries. Previously the only libraries were those included with the Joomla framework.
Attached below is our beta release for "PHPXMLRPC Library" (that is a mouthful!) for Joomla 1.6. This is not much more than a repackaging of the latest release of the library "phpxmlrpc" we could find (not the version that was included 1.5, but a newer one). Install it the same way you would any extension.
Let us know if you encounter any trouble installing to Joomla 1.6. We can't provide direct development support, but if there is truly something gone wrong in the code or you need more documentation, you can check out the original phpxmlrpc SourceForge site.
