The TDL Open Source Project (TOP) fosters the shared development and testing of contributed tools to manage TDL files, generate documentation and code. Find out more and get the code at:

TDL Toolset

To accelerate the adoption of TDL, TC MTS has commissioned an open source implementation of TDL in order to lower the barrier to entry for both users and tool vendors in getting started with using TDL. The open source implementation comprises graphical and textual editors, validation facilities, as well as a UML profile for TDL to enable the application of TDL in UML-based working environments.  It was made available in 2017 as an ETSI open source software project accessible from the TDL website and enabling contributions from the community.

The open source implementation is based on the Eclipse XText toolset to provide a set of Java libraries and Eclipse plugins to support the development of TDL specifications. Navigate the source at the git repository and find more information in the project wiki.


The TDL tools are available as a set of Eclipse plug-ins. You need to first be able to run Eclipse.

  1. Click the the following link to download Eclipse Modeling Tools distribution, which contains most of the necessary prerequisites for the TDL tools.
  2. Open the downloaded ZIP file, extract the content and open eclipse.exe, or the, which will run Ecplise.
  3. Once Eclipse is up and running, you need to add the update site for the TDL tools:

After the update site is added, the list of plug-ins and features shall be shown in the installation dialog (menu item Help->Install New Software..). Select the desired features and proceed with the installation, which will require Eclipse to be restarted once the installation is finished.

Find more detailed information at Installation wiki.


Are you a test designer, a test developer or a tool vendor? Your contribution is most welcome! Active contributions to the TDL standardisation require an ETSI membership. Any interested company can find how to become an ETSI member here.

The TOP source base is openly accessible. Its usage is governed by the Eclipse Public License (EPLv1). A source code contribution to TOP (merge request) requires adhering to EPLv1 and signing a Contributor Agreement between the developer and ETSI TC MTS beforehand. Find out more about TOP governance on the Governance wiki page.

If you have a EOL account you can log in directly. Otherwise you can register to create a new account at this page. Find out more information on how to contribute.


Development tools

TOP is developed using tools that are well known, developer friendly and open source.

Project governance

TOP project has been created to grow a community around TDL the test description language. The governing rules are decided within ETSI TC MTS itself. Every ETSI member is free to join. Any interested company can find how to become an ETSI member here.

Find more on the Project Leaders, Steering Group  and Advisory Group on the Project Governance wiki page.