I was wondering if it is possible to run an ETL transformation from EWL. Here I see two possibilities: either to call the java code for running the ETL script, or that there is some built in way of calling an etl script from EWL?
There's no built-in facility for calling ETL from EWL so I'd suggest writing a small Java tool [1] that parses and runs an ETL module, and calling it from your EWL script. If you'd like your transformation to use a model already loaded in a (GMF/tree/xtext) editor, InMemoryEmfModel [2] may be of use.