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robinberjon I wasn't trolling. There are lots of classes of structural constraints for which a schema is a concise, declarative description.
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robinberjon I'm not saying it's the right answer for every problem or that there aren't other answers. And sometimes I bet it's the wrong answer.
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robinberjon It happens, often, to be the right answer for the problems I encounter and care about. And sometimes missing where I'd like it.