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Downloads: REFI-QDA Project

The documents available below enable users to understand the REFI-QDA Project, and software developers to implement it. If you are implementing the export and import option for the REFI-QDA Project in your software, please refer to it in your menu texts as: REFI-QDA Project.

You can download

  • the UML class diagram

  • an introduction by Fred van Blommestein to the class model

  • the REFI-QDA Project XML specification

  • the XSD schema

UML class diagram of the REFI-QDA Project

UML class diagram of the REFI-QDA Project

An introduction to the class diagram can be downloaded here.

XSD schema of the REFI-QDA Project

The XML schema of an imported or exported Project is a description of a type of XML document (here a .qdpx file) expressed in terms of constraints on the structure and content of .qdpx files.


This means that beyond the basic syntactical constraints imposed by XML itself (a well formed xml file), each .qdpx file exported from a software should be valid according to this .xsd file. 


The XSD file of the REFI-QDA Project can be downloaded here

Specification of the REFI-QDA Project

The complete specification can be downloaded as a pdf file here.

If you have implemented the REFI-QDA Project in your own software we expect you to have both the import and export option available and validated against our xsd file.


If you want to be listed on this website we want you to provide an example .qdpx file for testing first.


Please contact us at

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