The While language
  This article presents a formalisation of a simple imperative programming language. The objective is to study and develop "hands-on" a formal specifcation of a programming language, namely its syntax, operational semantics and type system. To have an executable version of the language, we implemented in Racket its operational semantics and type system. 
Cl\'audio Vasconcelos and Ant\'onio Ravara
cs.PL