Also, the whole SRFI project (http://srfi.schemers.org/final-srfis.html http://srfi.schemers.org/final-srfis.html) is an attempt to create APIs that are not par

Also, the whole SRFI project (http://srfi.schemers.org/final-srfis.html http://srfi.schemers.org/final-srfis.html) is an attempt to create APIs that are not part of the core language, but are common across implementations that choose to support them.