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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>R6RS: Scheme</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">▼</a></td><td></td><td><a href="" class="tocviewselflink" data-pltdoc="x">R6RS:<span class="mywbr"> </span> Scheme</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="Using_R6RS_with_DrRacket.html" class="tocviewlink" data-pltdoc="x">Using R<span style="vertical-align: super; font-size: 80%">6</span>RS with Dr<span class="mywbr"> </span>Racket</a></td></tr><tr><td align="right">2 </td><td><a href="Running_Top-Level_Programs.html" class="tocviewlink" data-pltdoc="x">Running Top-<wbr></wbr>Level Programs</a></td></tr><tr><td align="right">3 </td><td><a href="Installing_Libraries.html" class="tocviewlink" data-pltdoc="x">Installing Libraries</a></td></tr><tr><td align="right">4 </td><td><a href="r6rs-mod.html" class="tocviewlink" data-pltdoc="x">R<span style="vertical-align: super; font-size: 80%">6</span>RS Module Language</a></td></tr><tr><td align="right">5 </td><td><a href="libpaths.html" class="tocviewlink" data-pltdoc="x">Libraries and Collections</a></td></tr><tr><td align="right">6 </td><td><a href="Language_Interoperability.html" class="tocviewlink" data-pltdoc="x">Language Interoperability</a></td></tr><tr><td align="right">7 </td><td><a href="conformance.html" class="tocviewlink" data-pltdoc="x">R<span style="vertical-align: super; font-size: 80%">6</span>RS Conformance</a></td></tr><tr><td align="right">8 </td><td><a href="R6RS_Libraries.html" class="tocviewlink" data-pltdoc="x">R<span style="vertical-align: super; font-size: 80%">6</span>RS Libraries</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><span class="tocsublinknumber"></span><a href="#%28part._top%29" class="tocsubseclink" data-pltdoc="x">R6RS:<span class="mywbr"> </span> Scheme</a></td></tr></table></div></div><div class="maincolumn"><div class="main"><div class="versionbox"><span class="version">6.7</span></div><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.7", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">top</a></span><span class="navright"> <span class="nonavigation">← prev</span> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">up</a> <a href="Using_R6RS_with_DrRacket.html" title="forward to "1 Using R6RS with DrRacket"" data-pltdoc="x">next →</a></span> </div><h2 x-source-module="(lib "r6rs/scribblings/r6rs.scrbl")" x-source-pkg="r6rs-doc" x-part-tag=""top""><a name="(part._top)"></a><a name="(part._.R6.R.S__.Scheme)"></a>R6RS: Scheme</h2><p>The <a href="r6rs-std/index.html">The Revised<span style="vertical-align: super; font-size: 80%">6</span> Report
on the Algorithmic Language Scheme</a> defines a dialect of Scheme. We
use <span style="font-style: italic">R<span style="vertical-align: super; font-size: 80%">6</span>RS</span> to refer to both the standard and the language
defined by the standard.</p><blockquote class="refpara"><blockquote class="refcolumn"><blockquote class="refcontent"><p>See <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=guide&rel=dialects.html&version=6.7" class="Sq" data-pltdoc="x">Dialects of Racket and Scheme</a> for general information about different
dialects of Scheme within Racket.</p></blockquote></blockquote></blockquote><p>R<span style="vertical-align: super; font-size: 80%">6</span>RS defines both <span style="font-style: italic">libraries</span> and <span style="font-style: italic">top-level
programs</span>. Both correspond to Racket <span style="font-style: italic">modules</span> (see
<a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=guide&rel=modules.html&version=6.7" class="Sq" data-pltdoc="x">Modules</a>). That is, although R<span style="vertical-align: super; font-size: 80%">6</span>RS defines
top-level programs as entry points, you can just as easily treat a
library as an entry point when using Racket. The only difference
is that an R<span style="vertical-align: super; font-size: 80%">6</span>RS top-level program cannot export any bindings to
other modules.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="Using_R6RS_with_DrRacket.html" class="toptoclink" data-pltdoc="x">1<span class="hspace"> </span>Using R<span style="vertical-align: super; font-size: 80%">6</span>RS with DrRacket</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Running_Top-Level_Programs.html" class="toptoclink" data-pltdoc="x">2<span class="hspace"> </span>Running Top-Level Programs</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Installing_Libraries.html" class="toptoclink" data-pltdoc="x">3<span class="hspace"> </span>Installing Libraries</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="r6rs-mod.html" class="toptoclink" data-pltdoc="x">4<span class="hspace"> </span>R<span style="vertical-align: super; font-size: 80%">6</span>RS Module Language</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="r6rs-mod.html#%28part._using-r6rs%29" class="toclink" data-pltdoc="x">4.1<span class="hspace"> </span>Using R<span style="vertical-align: super; font-size: 80%">6</span>RS</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="r6rs-mod.html#%28part._.The_.Implementation_of_.R6.R.S%29" class="toclink" data-pltdoc="x">4.2<span class="hspace"> </span>The Implementation of R<span style="vertical-align: super; font-size: 80%">6</span>RS</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="libpaths.html" class="toptoclink" data-pltdoc="x">5<span class="hspace"> </span>Libraries and Collections</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Language_Interoperability.html" class="toptoclink" data-pltdoc="x">6<span class="hspace"> </span>Language Interoperability</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="conformance.html" class="toptoclink" data-pltdoc="x">7<span class="hspace"> </span>R<span style="vertical-align: super; font-size: 80%">6</span>RS Conformance</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html" class="toptoclink" data-pltdoc="x">8<span class="hspace"> </span>R<span style="vertical-align: super; font-size: 80%">6</span>RS Libraries</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fbase-6%29" class="toclink" data-pltdoc="x">8.1<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">base</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Base</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Funicode-6%29" class="toclink" data-pltdoc="x">8.2<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">unicode</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Unicode</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fbytevectors-6%29" class="toclink" data-pltdoc="x">8.3<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">bytevectors</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Bytevectors</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Flists-6%29" class="toclink" data-pltdoc="x">8.4<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">lists</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: List utilities</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fsorting-6%29" class="toclink" data-pltdoc="x">8.5<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">sorting</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Sorting</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fcontrol-6%29" class="toclink" data-pltdoc="x">8.6<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">control</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Control Structures</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Frecords%2Fsyntactic-6%29" class="toclink" data-pltdoc="x">8.7<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">records</span><span class="stt"> </span><span class="RktSym">syntactic</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Records: Syntactic</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Frecords%2Fprocedural-6%29" class="toclink" data-pltdoc="x">8.8<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">records</span><span class="stt"> </span><span class="RktSym">procedural</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Records: Procedural</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Frecords%2Finspection-6%29" class="toclink" data-pltdoc="x">8.9<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">records</span><span class="stt"> </span><span class="RktSym">inspection</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Records: Inspection</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fexceptions-6%29" class="toclink" data-pltdoc="x">8.10<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">exceptions</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Exceptions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fconditions-6%29" class="toclink" data-pltdoc="x">8.11<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">conditions</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Conditions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fio%2Fports-6%29" class="toclink" data-pltdoc="x">8.12<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">io</span><span class="stt"> </span><span class="RktSym">ports</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: I/O: Ports</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fio%2Fsimple-6%29" class="toclink" data-pltdoc="x">8.13<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">io</span><span class="stt"> </span><span class="RktSym">simple</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: I/O: Simple</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Ffiles-6%29" class="toclink" data-pltdoc="x">8.14<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">files</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: File System</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fprograms-6%29" class="toclink" data-pltdoc="x">8.15<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">programs</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Command-line Access and Exit Values</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Farithmetic%2Ffixnums-6%29" class="toclink" data-pltdoc="x">8.16<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">arithmetic</span><span class="stt"> </span><span class="RktSym">fixnums</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Arithmetic: Fixnums</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Farithmetic%2Fflonums-6%29" class="toclink" data-pltdoc="x">8.17<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">arithmetic</span><span class="stt"> </span><span class="RktSym">flonums</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Arithmetic: Flonums</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Farithmetic%2Fbitwise-6%29" class="toclink" data-pltdoc="x">8.18<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">arithmetic</span><span class="stt"> </span><span class="RktSym">bitwise</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Arithmetic: Bitwise</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fsyntax-case-6%29" class="toclink" data-pltdoc="x">8.19<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">syntax-case</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Syntax-Case</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fhashtables-6%29" class="toclink" data-pltdoc="x">8.20<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">hashtables</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Hashtables</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fenums-6%29" class="toclink" data-pltdoc="x">8.21<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">enums</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Enumerations</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Feval-6%29" class="toclink" data-pltdoc="x">8.22<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">eval</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Eval</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fmutable-pairs-6%29" class="toclink" data-pltdoc="x">8.23<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">mutable-pairs</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Mutable Pairs</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fmutable-strings-6%29" class="toclink" data-pltdoc="x">8.24<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">mutable-strings</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: Mutable Strings</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="R6RS_Libraries.html#%28part._rnrs%2Fr5rs-6%29" class="toclink" data-pltdoc="x">8.25<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym">rnrs</span><span class="stt"> </span><span class="RktSym">r5rs</span><span class="stt"> </span><span class="RktPn">(</span><span class="RktVal">6</span><span class="RktPn">)</span><span class="RktPn">)</span>: R5RS Compatibility</a></p></td></tr><tr><td><p><span class="hspace"></span></p></td></tr><tr><td><p><span class="hspace"> </span><a href="doc-index.html" class="toptoclink" data-pltdoc="x">Index</a></p></td></tr></table><div 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