The following are the elements of the expression language.
Integer literals, rational literals, floating-point literals.
Quoted empty lists.
Variables.
Procedures:
not string-append * / truncate-modulo + - arithmetic-shift arithmetic-shift-right < <= > >= = eqv? in like and orSyntax:
if if-caseMore procedures:
coerce abs string-contains string-length string-lowercase string-uppercase string-trim string-trim-right round-quotient (?) substring string-trim-both