SRFI 216 is now in final status. This SRFI follows SRFI 203 in providing "out-of-the-box" support for hosting the exercises suggested by Structure and Interpretation of Computer Programs in portable Scheme. Whereas SRFI 203 focused on the necessarily non-portable aspects of the problem set (the graphics), this SRFI aims to provide support for the rest of the features, which are far more widespread, often already provided, and in reality mostly need just a common vocabulary. This SRFI provides...