This is the workflows written in legacy formats - Ab Initio, Informatica, IBM DataStage - this is a $10B+ industry - so lots of usage out there. They typically

This is the workflows written in legacy formats - Ab Initio, Informatica, IBM DataStage - this is a $10B+ industry - so lots of usage out there. They typically have graph formats and Domain Specific Languages to specify transformations. We reverse engineer them. Enterprises have 10s of thousands of these workflows and getting out of legacy lock-in is hard!