With each new generation of devices, there is a tendency to develop information systems completely from the start, because the old ones were optimised for the previous generation of devices. XML experience has now reached a stage at which it is possible to define guidelines on designing information systems that are device independent, and that have adaptable user interfaces. We show some of these guidelines illustrated by the design of health care provider Internet accessible information systems. We report on a marketplace for medical multimedia objects, called the GridSET Exchange, that is completely based on existing and emerging XML standards. It explores the possibility of using the new MPEG-7 standard for these type of applications. We use a semiautomatic editor generator to construct editors from MPEG-7 fragments.