Trying to track down some other reference, I see that there was work on formalising British nationality -- in Prolog! -- in 1986: https://www.doc.ic.ac.uk/~rak/

Trying to track down some other reference, I see that there was work on formalising British nationality -- in Prolog! -- in 1986: https://www.doc.ic.ac.uk/~rak/papers/British%20Nationality%20Act.pdf https://www.doc.ic.ac.uk/~rak/papers/British%20Nationality%2...