2.17.2 Rationale

Many Scheme systems provide access to a function called format. This function takes as arguments a format string, an ordinary Scheme string containing zero or more escape sequences, followed zero or more Scheme values. The procedure processes the format string and performs string replacement on the escape sequences according to the rules for each code. This SRFI defines a basic version of format which should allow portable code to be written using the function without much (if any) effort on the part of Scheme implementors.