TAXATION MANAGEMENT USING ASYCUDA++ Ó UNCTAD - SITE (V1.15) A.36 Keywords. Here is a list of the keywords that are used for writing rules. Keyword    Usage If If condition Then statements [Else statements] Endif then If condition Then statements [Else statements] Endif else If condition Then statements [Else statements] Endif Endif If condition Then statements [Else statements] Endif and condition 1 and condition 2 or condition 1 or condition 2 not not (condition 1) ( open parenthesis ) close parenthesis IS data element IS expression; (assignment statement) := data element := expression; (assignment statement) = expression 1 = expression 2 EQ expression 1 EQ expression 2 < expression 1 < expression 2 LT expression 1 LT expression 2 <= expression 1 <= expression 2 LE expression 1 LE expression 2 > expression 1 > expression 2 GT expression 1 GT expression 2 >= expression 1 >= expression 2 GE expression 1 GE expression 2 <> expression 1 <> expression 2 NE expression 1 NE expression 2 ; end of statement + expression 1 + expression 2 Plus expression 1 Plus expression 2 - expression 1 - expression 2 Minus expression 1 Minus expression 2 * expression 1 * expression 2 Mul expression 1 Mul expression 2 / expression 1 / expression 2 Div expression 1 Div expression 2 , function( expression 1, expression 2, ...)