FrontPage Blog published article on how to customize FP markup intellisense. The techique applies to Visual Studio 2002/2003 as well since FP uses similar mechanisms to drive markup intellisense and schemas are mostly compatible between VS and FP. However, Whidbey schemas are not directly compatible with FP 2003 since we changed intellisense engine significantly since VS 2003 and schemas are structured somewhat differently now. For example, Whidbey schemas employ xsd:include in order to reduce element duplication and schema sizes. It is technically possible to backport Whidbey schemas to VS 2003 and FP, but the work may be tedious.