Common Dylan provides several libraries relevant to formatting and printing strings, or otherwise using strings for output. These libraries include Format, Format-out, Print, and Standard-IO. The facilities provided by these libraries will be excess to many users' requirements, who may prefer to use the simple-format module that the common-extensions library exports.
The format-out function converts its arguments into a Dylan format string and then sends that string to the standard output. The format-to-string function converts its arguments into a format string and then returns that format string.
See "The SIMPLE-FORMAT module" on page 52 for reference descriptions of format-out and format-string.