Using PHP 5's SimpleXML
Adam Trachtenberg at ONLamp.com: "This article shows how to use SimpleXML to read an XML file, parse the results into a useful form, and query the document with XPath. I use RSS for the examples, since some versions of RSS are nice and easy. Then there's RSS 1.0. It uses RDF, multiple namespaces, and defines a default namespace for its elements. (Not so nice and easy.)"