Fig 5.

The multi-tier implementation of our framework provides a means to implement Grid based or web based electronic data interchange platform within a service-oriented architecture. End-user access to privileged data is managed in one or more ways: (1) a fully privileged user within the institutional firewall (left-hand side) can access the data in anyway they prefer; (2) an external user (located outside the firewall, right-hand side) is subject to additional restriction to access data; and (3) the multi-tier service-oriented approach allows for the deployment of custom services easily.