The role of XML in health care is evolving rapidly. Coupled with other W3C standards, informaticists can design systems that may be used not only for storage and retrieval of structured knowledge, but also for quick transformation of such knowledge into many different usable formats. At Intermountain Health Care, we are currently developing an XML-based document framework to accommodate both the capture of structured knowledge as well as its transformation into several usable formats. Our objective relies upon the premise that information systems can be implemented using workflows based on structured documents.