A unifying view on rules and principles
Both a rule and a principle are basically a connection between an antecedent and a consequent.
The differences disappear for a rule or principle in isolation.
Claim:
The seeming difference between rules and principles is a matter of degree.
? Verheij, B., Hage, J., and Herik, H.J. van den (1998). An integrated view on rules and principles. Artificial Intelligence and Law, Vol. 6, No. 1, pp. 3-26.