Business to Business (B2B) e-commerce is driving a new generation of Internet applications that will use XML as a model for sharing documents and information between organizations. Sophisticated B2B applications can dramatically automate business transactions and processes between organizations only if the business systems and data that drive the processes are integrated between the trading partners. While XML can greatly alleviate incompatibility between disparate applications, B2B applications can only automate business processes if there is an ability to describe collaborative workflows across organizations as well as providing data interoperability. This paper describes a system which can use XML document standards with an associated workflow engine for integrating business processes as well as applications and data via XML.