He's also the author of the very popular Professional Ajax.
Here's the beginning of the article:
XPath Support in Browsers
Because XML is used for so many kinds of data, it became necessary to create a means to locate data inside of XML code. The answer to this problem is XPath, which is a small language used specifically to locate a single node or multiple nodes that match a particular pattern.
Introduction to XPath
Every XPath expression has two parts: a context node and a node pattern. The context node provides the context from which the node pattern should begin. The node pattern is a string made up of one or more node selectors.
For instance, consider the following XML document:
<employee title="Software Engineer">
<name>Nicholas C. Zakas</name>
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Senior Acquisitions Editor
Wiley Technology Publishing
Jim's Book of the week: No book this week - Donate to the Red Cross!
Associate Publisher, WROX - A Wiley Brand
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