-* The Scheme language is standardized; the various implementations of the
-language usually adhere to what's published in the current standard and add on
-different handy extensions. The first standard was published in 1975. A
-revision was published in 1978 called "The revised report on Scheme, a
-dialect of Lisp." Thereafter, revisions of the standard were titled "The
-Revised Revised Report..." and so on, or "The Revised^n Report..." for
-short, for increasing n. The most widely implemented standard is [The
-Revised^5 Report on Scheme](http://docs.racket-lang.org/r5rs/index.html),
-or R5RS, published in 1998.
-\[ [Alt link](http://www.schemers.org/Documents/Standards/R5RS/HTML/) \]
-A new standard [R6RS](http://docs.racket-lang.org/r6rs/index.html) was ratified
-in 2007, but this has many detractors and has not been fully accepted in the
-community.
-\[ [Alt link](http://www.r6rs.org/final/html/r6rs/r6rs.html);
-[Libraries](http://www.r6rs.org/final/html/r6rs-lib/r6rs-lib.html) \]