RMS never played nice on interoperability. I wouldn’t bet on the CDL to become a useful standard, because it is under-powered, under-specified and stagnant.

The “open” alternative is OASIS. Their Open Exposure Data standard [1] is complete and supported by many industry participants. Unfortunately it’s a database based format, rather than a text based DSL, but still betterthan the alternatives.

[1] https://github.com/OasisLMF/OpenDataStandards/tree/master/Op...

Thank you! I wasn't aware of OASIS. Reading up now.