[medo-bear]

TLDR: "Haskell vs Ada vs C++" but a lisp wins in development hours by huge margin

I wonder if this is the 'relational lisp' in question

https://www.ap5.com/ap5-man.html

or

https://ieeexplore.ieee.org/document/13081

[lispm]

From what I understand, there was a successor to AP5 called Relational Lisp (-> rellisp). I don't think I've seen the source for that. AP5 is available and there have been updates to the implementation since many years.