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The Scheme language is standardized in the official [[Institute of Electrical and Electronics Engineers]] (IEEE) standard<ref name="ieee1178">1178-1990 (Reaff 2008) IEEE Standard for the Scheme Programming Language. IEEE part number STDPD14209, [https://web.archive.org/web/20100706171338/http://standards.ieee.org/board/rev/308minutes.html unanimously reaffirmed] at a meeting of the IEEE-SA Standards Board Standards Review Committee (RevCom), March 26, 2008 (item 6.3 on minutes), reaffirmation minutes accessed October 2009. This document is available from IEEE for purchase only, and not online at time of writing: 2009.</ref> <!--
-->and a ''de facto'' standard called the ''Revised{{padlsup|n}} Report on the Algorithmic Language Scheme'' (R''n''RS). A widely implemented standard is R5RS (1998).<ref name="r5rs">{{Cite journal |last1=Richard Kelsey |last2=William Clinger |last3=Jonathan Rees |last4=Rozas |first4=G.J. |last5=Adams Iv |first5=N.I. |last6=Friedman |first6=D.P. |last7=Kohlbecker |first7=E. |last8=Steele Jr. |first8=G.L. |last9=Bartley |first9=D.H. |display-authors=3 |date=August 1998 |title=Revised<sup>5</sup> Report on the Algorithmic Language Scheme |url=http://www.schemers.org/Documents/Standards/R5RS/ |journal=Higher-Order and Symbolic Computation |volume=11 |issue=1 |pages=7–105 |doi=10.1023/A:1010051815785 |access-date=2012-08-09 |s2cid=14069423|url-access=subscription }}</ref> <!--
-->The most recently ratified standard of Scheme<!--
--> is "R7RS-small" (2013).<ref name="r7rs">{{Cite web |date=2013-07-06 |title=R7RS final available |url=http://trac.sacrideo.us/wg/raw-attachment/wiki/WikiStart/r7rs.pdf}}</ref> The more expansive and modular R6RS was ratified in 2007.<ref name="r6rs">{{Cite web |last1=Sperber |first1=Michael |last2=Dybvig |first2=R. Kent |last3=Flatt |first3=Matthew |last4=Van Straaten |first4=Anton |display-authors=etal |date=August 2007 |title=Revised<sup>6</sup> Report on the Algorithmic Language Scheme (R6RS) |url=http://www.r6rs.org |access-date=2011-09-13 |publisher=Scheme Steering Committee}}</ref> Both trace their descent from R5RS; the timeline below reflects the chronological order of ratification.<!--
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