W. Scott Means has been a professional software developer since 1988, when he joined Microsoft Corporation at the age of 17. He was one of the original developers of OS/2 1.1 and Windows NT, and he did some of the early work on the Microsoft Network for the Advanced Technology and Business Development group. Most recently, he served as the CEO of Enterprise Web Machines, a South Carolinandbased Internet infrastructure venture. He is currently writing full-time and consulting on XML and Internet topics. This is his second book. He may be reached via email at firstname.lastname@example.org.