, 
Authors: Stian Soiland-Reyes 1,2, David Withers, Alan R Williams1,2, Donal Fellows1,2, Matthew Gamble2, Carole Goble2
1 Apache Software Foundation; 2 University of Manchester
This article describes the workflow language of
Apache Taverna \cite{Wolstencroft_2013},
in particular focusing on its workflow language SCUFL2 and the abstract semantic
workflow model wfdesc.
The SCUFL2 API \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 IWIR,
MG-RAST AWE) and the Common Workflow Language
This includes the general semantic model
wfdesc
which we have created within the
Wf4Ever project \cite{Hettne_2014}
for the purpose of workflow preservation and annotation.
wfdesc is easily combined with W3C PROV-based
workflow provenance,
and is also used by the digital
preservation project SCAPE
to find and compose semantically
described Workflow Components from the myExperiment workflow
repository.