Higher-order Datalog

[v217]

Added expressivity compatible with your ideas:
Extensional Higher Order Prolog by Bill Wadge.
There is also a very short paper specifically about datalog:
Kountouriotis, Vassilis, Panos Rondogiannis, and William W. Wadge. "Extensional higher-order datalog." Proceedings of the 12th International Conference on Logic for Programming, Artificial Intelligence and Reasoning (Short Paper). 2005.

PS:
Datafun should be now on this ever growing list.

[rntz]

Thanks, that looks very interesting! It will take me a while to fully digest, I imagine.