Anecdotally, I've really enjoyed using ION[0] at Amazon. It has all of the features the OP wants, besides semantic whitespace which I'm not a fan of. [0] http:

Anecdotally, I've really enjoyed using ION[0] at Amazon. It has all of the features the OP wants, besides semantic whitespace which I'm not a fan of. [0] http://amznlabs.github.io/ion-docs/index.html http://amznlabs.github.io/ion-docs/index.html