Medical Domain Web Services (MDWS) (pronounced meadows) is a suite of Service Oriented Architecture (SOA) middle-tier web services that exposes medical domain functionality, Medical Domain Objects (MDO). MDWS is equipped with the capacity to virtualize any legacy Veterans Health Information Systems and Technology Architecture (VistA) Remote Procedure Call (RPC) as a web service. A web service is an Application Programming Interface (API), which uses Simple Object Access Protocol (SOAP), the standardized protocol to communicate with subscribed client applications.

This MDWS Group at OSEHRA is intended to coordinate the further developmenta and maintenance of MDWS as an Open Source project.

The source code repositories of MDWS can be found here:



Community Wiki can be found here:

Weekly calls on Fridays from 12:30 PM to 1:00pm EST.

Dial in: 1-650-479-3207

Access code: 667 800 761



Interested in MDWS for the scheduling competition? Please see the following information about the current state of MDWS scheduling services: