On 02/07/2015 19:50, Matthias Felleisen wrote:

Let me add one thought here. One of the thoughts I have played with in this 
context is to have a dissertation on XML-style type extensions for Typed Racket 
(CDuce, XDuce). I am not interested in XML (or JSON) per se but in type systems 
that can say more about S-expression-like data. Of course, as in the past, this 
would have to be balanced between theoretical expressive power and practical 
expressiveness/impact. (We tend to err in the direction of the former, because 
we finance Racket via research grants.)

That reminds me of an approach that is more than 20 years old:

  http://www.sciencedirect.com/science/article/pii/030439759290302V

That kind of type system should fit many kinds of s-expressions nicely.

Konrad.

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