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Work in progress: Conversion from the old ALS Manual. Please be patient.

#The ALS Prolog Language: Standard Part

##1 The Syntax of ALS Prolog This chapter describes the syntax of ALS Prolog, which is for the most part the syntax of the ISO Prolog standard . Prolog syntax is quite simple and regular, which is a great strength.

###1.1 Constants The simplest Prolog data type is a constant, which comes in two flavors: • atoms (sometimes called symbols) • numbers The notion of a constant corresponds roughly to the notion of a name in a natural language. Names in natural languages refer to things (which covers a lot of ground), and constants in Prolog are be used to refer to things when the language is interpreted.