Hah. I knew there was going to be something like the paper below and this article reminded me to have a rummage around the web for it:
https://pdfs.semanticscholar.org/dc2a/541491efc369a151a62c46...
Advanced applications of APL: logic programming, neural networks and hypertext. M. Alfonseca, IBM Systems Journal, Vol 30, No. 4, 1991.
This paper reviews the work of the author on the application of the APL and APL2 languages to logic programming, emulation of neural networks and the programming of hypertext applications