Transcript PPT - MedBiquitous

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)
Virtual
Patient Data
Data Availability Model
Activity
Model
Media Resources
SCORM-Package
• 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
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
The MVP Player: Workflow
„getPage“
Server
Modifies state
JSON-packed
response
MVP
Package
Object-Model
Serialization
XHTML
fragment
Transformation
via XSLT
XML
file
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 http://code.google.com/p/mvp-evip-xslt-testsuite/
Any questions?
Thank you.
Contact:
Centre for Virtual Patients
University Hospital Heidelberg
http://campusvirtualpatients.com