Below are the Domain Specific Languages (DSL) that Cromwell currently supports and will soon support for describing your workflow.
Current Language Support
WDL Draft 2
Cromwell started life as a WDL engine and WDL draft2 was our first language! For many examples on how to use WDL and some great getting-started resources you can view the OpenWDL site.
Cromwell supports the majority of Draft-2 of the WDL Spec.
- Be careful when using
Object. They are superceded by 'struct' in WDL 1.0 and are being removed outright in WDL 2.0.
- Cromwell does not support nested
scatters in draft-2.
Cromwell also supports WDL version 1.0.
As well as the changes to the WDL spec between draft-2 and 1.0, Cromwell also supports nested scatters and the localization_optional optimization in WDL 1.0.
Future Language Support
As the SPEC is being improved and honed, Cromwell continues to support the current
development version of WDL. That
means that when (or shortly after) new versions are published, Cromwell will be ready to support them.