- (string<? string[1] string[2] string[3] ...)procedure
- (string>? string[1] string[2] string[3] ...)procedure
- (string<=? string[1] string[2] string[3] ...)procedure
- (string>=? string[1] string[2] string[3] ...)procedure
These procedures are the lexicographic extensions to strings of the corresponding orderings on characters. For example, string<? is the lexicographic ordering on strings induced by the ordering char<? on characters. If two strings differ in length but are the same up to the length of the shorter string, the shorter string is considered to be lexicographically less than the longer string.