This six-page tutorial explains how to parse xml using DOM, an alternative to the popular Expat. Covers the objects used in DOM extensively, and offers a few simple and long examples.
This article, along with source code, explains how to parse XML documents using XSLT (eXtensible Stylesheet Language Transformations). XSLT is a language for transforming XML documents into other XML documents or HTML documents. It does not discuss XML, XSL or XSLT syntax, but rather focuses on how to transform XML documents with XSLT using the Sablotron XSLT processor. Source code available for download.
What if you could script remote procedure calls between web sites as easily as you can between programs? This tutorial shows how it can be done in PHP.
This tutorial shows how to parse XML documents in PHP. It walks you through a fairly simple application of XML that you can use to implement a news system for your home page.