Norman Walsh is an XML Standards Architect in the XML Technology Center at Sun Microsystems, Inc. Norm is an active participant in a number of standards efforts worldwide, including the XML Core, XSL and XML Schema Working Groups of the World Wide Web Consortium, the OASIS XSLT Conformance and RELAX NG Committees, the OASIS Entity Resolution Committee for which he is the editor, and the OASIS DocBook Technical Committee, which he chairs.He is the principal author of "DocBook: The Definitive Guide", published by O'Reilly & Associates.