Implementation of a medbiquitous virtual patient compatible web player
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Implementation Of A MedBiquitous Virtual Patient Compatible Web-Player. Hess F, Heid J, Huber S, Haag M Centre for Virtual Patients, University Hospital of Heidelberg. The MedBiq Virtual Patient (MVP). SCORM-Package. Virtual Patient Data. Data Avail- ability Model. Activity Model.

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Implementation Of A MedBiquitous Virtual Patient Compatible Web-Player

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Implementation Of A MedBiquitous Virtual Patient Compatible Web-Player

Hess F, Heid J, Huber S, Haag M

Centre for Virtual Patients, University Hospital of Heidelberg

The MedBiq Virtual Patient (MVP)



Patient Data

Data Avail-

ability Model



  • XML files, combined with XPath expressions

  • Defines the interaction (Activity Model) between aggregated (Data Availability Model) data elements (Virtual Patient Data and Media Resources) for branched nodes

Media Resources

Starting Position: An Existing System

  • CAMPUS, a system for learning with Virtual Patients exists since 1996

  • Consists of

    • An authoring system

    • A simulative Java based player

    • A card-based DHTML player

    • An application for secure, keyfeature-based assessments

  • Based on vocabularies

  • Linear order of interactions

The MVP Spec: „And Now for Something Completely Different”

  • The MVP spec is based on free text, not on vocabularies

  • The MVP spec defines a network of nodes, no linear order

  • Knowledge questions are not directly supported by the MVP

How to Overcome Those Differences?

  • Free text can‘t be matched with a vocabulary automatically

  • An export is quite simple as a linear path is possible in the MVP

  • The knowledge questions can be mapped to XHTML and/or added via extensions

  • The keyfeature editor, used for assessments, can be used to import and export free text nodes

Screenshot of the Keyfeature Editor

Finally: Displaying MVP VPs

  • To support all MVP VPs within CAMPUS a new MVP compatible player has to be developed

  • Because of the complexity of the MVP spec a pure client-side implementation is not recommendable

  • Different display modes and system based optimizations are possible with a server component

The MVP Player: Technical View

  • Uses a full featured Java server component and a lightweight client written in HTML and JavaScript

  • Holding the object tree as Java objects for supporting MVP rules and display modes

  • Rendering the XHTML code using W3C standard XSLT

  • Uses Ajax for communication between client and server („getNode“)

The MVP Player: Screenshot


Modifies state








via XSLT

The MVP Player: Workflow






Where we are now…

  • Tested with the three other systems of the European „electronic Virtual Patients” (eViP) project

  • Support for QTI IMS extension

  • Support for W3Cs Timed Text

  • Need for other MVP packages

  • Free and open sourced MVP test suite available at

Any questions?

Thank you.


Centre for Virtual Patients

University Hospital Heidelberg

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