Priscilla Walmsley serves as Managing Director of Datypic, a consultancy specializing in XML architecture and design, SOA and Web services implementation, and content management. She was a member of the W3C XML Schema Working Group from 1999 to 2004. She is the author of XQuery from O'Reilly and Definitive XML Schema (Prentice Hall). In addition, she co-authored the book Web Service Contract Design and Versioning for SOA. Priscilla lives (and usually works) in downtown Traverse City, Michigan.