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> it looks pretty much like what folks have been doing in other languages for a long time.

It looks pretty much like what folks have been doing in Swift for a very long time. DocC is just Apple’s own version of Jazzy / SwiftDoc / appledoc. There’s no catchup here, it’s just Apple making an “official” version of something that already exists.

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Apple's comment system has existed for much longer than Swift.

https://en.wikipedia.org/wiki/HeaderDoc

Also: Xcode has been able to parse and display the Markdown documentation comments in Swift code for years. It's really nice! Doesn't mean DocC isn't worthwhile, but at least the PSOTU and Meet DocC presentation seemed to not only ignore outside prior art, but Xcode's existing capabilities too.

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