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