Enosys Markets offers a state-of-the-art data integration software platform to support the development of the next generation of eBusiness applications that deliver value by providing new levels of function for customer relationship management, ecommerce, supply chain management, and decision support. These applications require that data be integrated from information sources that exist both within and across organizational boundaries. The Enosys Markets data integration architecture and product family provides a complete end-to-end XMLbased solution for integrating and querying distributed information sources. It incorporates advanced research into XML and database technology. We present the product architecture and components, discuss the key technical challenges, and outline the technical concepts and innovations employed in the Enosys platform. Keywords Mediators, semistructured data, XML, query forms, reports, distributed querying, heterogeneous databases, integration.