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* Clarifies the characteristics of the previous value. Fixes #1412

* Delete "clock" row in the variability table.

* Improves aesthetics of Variability table. Delete first column since every row is about variability.

* Delete inconsistent inline definition of clocks. Replaced by link to clocks.

* Fix capitalization

* Remove extra column from "Table 20. Allowed combinations of variability/causality."

Co-authored-by: Torsten Sommer <>

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Functional Mock-up Interface


The Functional Mock-up Interface (FMI) is a free standard that defines an interface to exchange dynamic models using a combination of XML files, binaries and C code. It’s supported by 100+ tools and maintained as a Modelica Association Project.

Releases and the latest development version of the specification are available on the FMI website.

Repository Structure

  • docs — sources of the specification document

  • headers — header files of the C-API

  • schema — XSD schema for the modelDescription.xml

  • CONTRIBUTING.adoc — info on contributing to the project and building the specification document

  • README.adoc — this document


  • master — development of the next release

  • support/v2.0.x — maintenance of the 2.0 release

Code and documentation copyright © 2008-2011 the MODELISAR consortium and 2012-2021 the Modelica Association Project FMI. Code released under the 2-Clause BSD License. Docs released under Attribution-ShareAlike 4.0 International.