I'd consider a situation where you've got a human readable (?) data format that needs to be validated a rather specific niche for a domain specific language. All I'm aware of in that area is XSD and DTD for XML (and maybe some recent efforts to make schemas for JSON but those aren't too flexible).
I'm happy someone is trying to fill that niche though, I'll remember cue for when I run into such a scenario.
I'm happy someone is trying to fill that niche though, I'll remember cue for when I run into such a scenario.