This framework written in object oriented PHP4 can create RSS 2.0 feeds. Because the transformation from objects to RSS feed happens via XSLT, you can just as well transform the objects into whatever you want, if you have your own transformation file.
XML Based MySQL Interface with Ajax Frontend.
INterface Library for Amazon Web Services (INLAWS) is a PHP based library for searching, browsing and displaying content from the Amazon.com Web Services, including shopping carts and reviews, for the purpose of building Amazon Powered online stores.
On Stop surely a show stopper.
pXw4Pa (poor XML wrapper for PHP arrays) are 2 simple php functions written with php4.3.7 that can read/write a php array from/to an xml file. Can be used to store data on xml files simply and fast, without to make use of others big stuff.