Sometimes ago I read that some components of IBM Watson were implemented in prolog . So I decided to look at it again after many years… I like Prolog, I studied prolog at Computer Science University of Milan and for my thesis I wrote code in Prolog (and Lisp). proloGraph is a simple example of howto exposing a prolog graph database to other applications,  building a REST web service. I used swi-prolog and its http library Install the prolog language (I used the fantastic Linux Debian distribution) withapt-get install swi-prologclone my git repositorygit clone https://github.com/matteoredaelli/proloGraph cd proloGraphRun it withswipl -s webserver.pl -g 'server(8765).'Open the following url with your browserhttp://localhost:8765/vertex?name=user(matteo)and you will get:``` { “prev”: [ {“from”:“user(gabriele)”, “to”:“user(matteo)”, “rel”:“follow”} ], “next”: [ {“from”:“user(matteo)”, “to”:“user(ele)”, “rel”:“follow”}, {“from”:“user(matteo)”, “to”:“user(gabriele)”, “rel”:“follow”}, {“from”:“user(matteo)”, “to”:“user(4)”, “rel”:“follow”}, {“from”:“user(matteo)”, “to”:“country(italy)”, “rel”:“lives”}, {“from”:“user(matteo)”, “to”:“hobby(running)”, “rel”:“likes”} ] }