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Authors: Stian Soiland-Reyes, David Withers, Alan R Williams, Donal Fellows, Carole Goble  This article describes thenext  major version of the [Taverna  workflow system](http://www.taverna.org.uk/) language of   [Apache Taverna](http://taverna.incubator.apache.org/)  \cite{Wolstencroft_2013}, in particular focusing on its workflow language SCUFL2 _SCUFL2_  and the abstract semantic workflow model wfdesc. _wfdesc_.  The [SCUFL2 API](https://github.com/taverna/taverna-scufl2/) \cite{3721cfa2-edd7-43f1-825a-6b5044f0d0db}  allows construction and inspection of Taverna 3  workflows from independent applications, but also enables translation  from/to different abstract and concrete third-party workflow formats  ([SHIWA](http://www.shiwa-workflow.eu/) IWIR,  [MG-RAST](http://blog.metagenomics.anl.gov/) AWE). AWE) and the [Common Workflow Language](https://github.com/common-workflow-language/common-workflow-language)  This includes the general semantic model  [wfdesc](http://purl.org/wf4ever/model#wfdesc)