Internal vs External DSL s

I listened to this Podcast this morning about domain specific languages.?

I won't give a round up of the podcast as it's worth listening to yourself. One interesting thing I thought about was that if you have top write a whole DSL just to desribe your business logic, couldn't you save time and write it in Gherkin instead. The business rules could then be the tests upon which the program works but you don't have to write a whole new language...

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