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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>6&nbsp;Low-Level Scribble API</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="../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="../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,&quot;tocview_0&quot;);">&#9658;</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">Scribble:<span class="mywbr"> &nbsp;</span> The Racket Documentation Tool</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1&nbsp;</td><td><a href="getting-started.html" class="tocviewlink" data-pltdoc="x">Getting Started</a></td></tr><tr><td align="right">2&nbsp;</td><td><a href="reader.html" class="tocviewlink" data-pltdoc="x">@ Syntax</a></td></tr><tr><td align="right">3&nbsp;</td><td><a href="generic-prose.html" class="tocviewlink" data-pltdoc="x">High-<wbr></wbr>Level Scribble API</a></td></tr><tr><td align="right">4&nbsp;</td><td><a href="plt-manuals.html" class="tocviewlink" data-pltdoc="x">Scribbling Documentation</a></td></tr><tr><td align="right">5&nbsp;</td><td><a href="lp.html" class="tocviewlink" data-pltdoc="x">Literate Programming</a></td></tr><tr><td align="right">6&nbsp;</td><td><a href="" class="tocviewselflink" data-pltdoc="x">Low-<wbr></wbr>Level Scribble API</a></td></tr><tr><td align="right">7&nbsp;</td><td><a href="running.html" class="tocviewlink" data-pltdoc="x">Running <span class="stt">scribble</span></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 class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,&quot;tocview_1&quot;);">&#9660;</a></td><td>6&nbsp;</td><td><a href="" class="tocviewselflink" data-pltdoc="x">Low-<wbr></wbr>Level Scribble API</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">6.1&nbsp;</td><td><a href="layers.html" class="tocviewlink" data-pltdoc="x">Scribble Layers</a></td></tr><tr><td align="right">6.2&nbsp;</td><td><a href="reader-internals.html" class="tocviewlink" data-pltdoc="x">@ Reader Internals</a></td></tr><tr><td align="right">6.3&nbsp;</td><td><a href="core.html" class="tocviewlink" data-pltdoc="x">Structures And Processing</a></td></tr><tr><td align="right">6.4&nbsp;</td><td><a href="renderer.html" class="tocviewlink" data-pltdoc="x">Renderers</a></td></tr><tr><td align="right">6.5&nbsp;</td><td><a href="decode.html" class="tocviewlink" data-pltdoc="x">Decoding Text</a></td></tr><tr><td align="right">6.6&nbsp;</td><td><a href="doclang.html" class="tocviewlink" data-pltdoc="x">Document Language</a></td></tr><tr><td align="right">6.7&nbsp;</td><td><a href="docreader.html" class="tocviewlink" data-pltdoc="x">Document Reader</a></td></tr><tr><td align="right">6.8&nbsp;</td><td><a href="xref.html" class="tocviewlink" data-pltdoc="x">Cross-<wbr></wbr>Reference Utilities</a></td></tr><tr><td align="right">6.9&nbsp;</td><td><a href="tag.html" class="tocviewlink" data-pltdoc="x">Tag Utilities</a></td></tr><tr><td align="right">6.10&nbsp;</td><td><a href="blueboxes.html" class="tocviewlink" data-pltdoc="x">Blue Boxes Utilities</a></td></tr><tr><td align="right">6.11&nbsp;</td><td><a href="config.html" class="tocviewlink" data-pltdoc="x">Extending and Configuring Scribble Output</a></td></tr></table></div></div></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, &quot;6.7&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.7&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<a href="lp.html" title="backward to &quot;5 Literate Programming&quot;" data-pltdoc="x">&larr; prev</a>&nbsp;&nbsp;<a href="index.html" title="up to &quot;Scribble: The Racket Documentation Tool&quot;" data-pltdoc="x">up</a>&nbsp;&nbsp;<a href="layers.html" title="forward to &quot;6.1 Scribble Layers&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div><h3 x-source-module="(lib &quot;scribblings/scribble/scribble.scrbl&quot;)" x-source-pkg="scribble-doc" x-part-tag="&quot;internals&quot;">6<tt>&nbsp;</tt><a name="(part._internals)"></a>Low-Level Scribble API</h3><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="layers.html" class="toclink" data-pltdoc="x">6.1<span class="hspace">&nbsp;</span>Scribble Layers</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="layers.html#%28part._.Typical_.Composition%29" class="toclink" data-pltdoc="x">6.1.1<span class="hspace">&nbsp;</span>Typical Composition</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="layers.html#%28part._.Layer_.Roadmap%29" class="toclink" data-pltdoc="x">6.1.2<span class="hspace">&nbsp;</span>Layer Roadmap</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="reader-internals.html" class="toclink" data-pltdoc="x">6.2<span class="hspace">&nbsp;</span>@ Reader Internals</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="reader-internals.html#%28part._.Using_the___.Reader%29" class="toclink" data-pltdoc="x">6.2.1<span class="hspace">&nbsp;</span>Using the @ Reader</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="reader-internals.html#%28part._.Syntax_.Properties%29" class="toclink" data-pltdoc="x">6.2.2<span class="hspace">&nbsp;</span>Syntax Properties</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="reader-internals.html#%28part._at-exp-lang%29" class="toclink" data-pltdoc="x">6.2.3<span class="hspace">&nbsp;</span>Adding @-expressions to a Language</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="reader-internals.html#%28part._.Interface%29" class="toclink" data-pltdoc="x">6.2.4<span class="hspace">&nbsp;</span>Interface</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="core.html" class="toclink" data-pltdoc="x">6.3<span class="hspace">&nbsp;</span>Structures And Processing</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="core.html#%28part._parts%29" class="toclink" data-pltdoc="x">6.3.1<span class="hspace">&nbsp;</span>Parts, Flows, Blocks, and Paragraphs</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="core.html#%28part._tags%29" class="toclink" data-pltdoc="x">6.3.2<span class="hspace">&nbsp;</span>Tags</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="core.html#%28part._style%29" class="toclink" data-pltdoc="x">6.3.3<span class="hspace">&nbsp;</span>Styles</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="core.html#%28part._passes%29" class="toclink" data-pltdoc="x">6.3.4<span class="hspace">&nbsp;</span>Collected and Resolved Information</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="core.html#%28part._.Structure_.Reference%29" class="toclink" data-pltdoc="x">6.3.5<span class="hspace">&nbsp;</span>Structure Reference</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="core.html#%28part._.H.T.M.L_.Style_.Properties%29" class="toclink" data-pltdoc="x">6.3.6<span class="hspace">&nbsp;</span>HTML Style Properties</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="core.html#%28part._.Latex_.Style_.Properties%29" class="toclink" data-pltdoc="x">6.3.7<span class="hspace">&nbsp;</span>Latex Style Properties</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html" class="toclink" data-pltdoc="x">6.4<span class="hspace">&nbsp;</span>Renderers</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html#%28part._.Rendering_.Driver%29" class="toclink" data-pltdoc="x">6.4.1<span class="hspace">&nbsp;</span>Rendering Driver</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html#%28part._.Base_.Renderer%29" class="toclink" data-pltdoc="x">6.4.2<span class="hspace">&nbsp;</span>Base Renderer</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html#%28part._.Text_.Renderer%29" class="toclink" data-pltdoc="x">6.4.3<span class="hspace">&nbsp;</span>Text Renderer</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html#%28part._.Markdown_.Renderer%29" class="toclink" data-pltdoc="x">6.4.4<span class="hspace">&nbsp;</span>Markdown Renderer</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html#%28part._.H.T.M.L_.Renderer%29" class="toclink" data-pltdoc="x">6.4.5<span class="hspace">&nbsp;</span>HTML Renderer</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html#%28part._.Latex_.Renderer%29" class="toclink" data-pltdoc="x">6.4.6<span class="hspace">&nbsp;</span>Latex Renderer</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html#%28part._.P.D.F_.Renderer%29" class="toclink" data-pltdoc="x">6.4.7<span class="hspace">&nbsp;</span>PDF Renderer</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="renderer.html#%28part._.Contract__.Blue_boxes__.Renderer%29" class="toclink" data-pltdoc="x">6.4.8<span class="hspace">&nbsp;</span>Contract (Blue boxes) Renderer</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="decode.html" class="toclink" data-pltdoc="x">6.5<span class="hspace">&nbsp;</span>Decoding Text</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="doclang.html" class="toclink" data-pltdoc="x">6.6<span class="hspace">&nbsp;</span>Document Language</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="doclang.html#%28part._scribble_doclang%29" class="toclink" data-pltdoc="x">6.6.1<span class="hspace">&nbsp;</span><span class="RktModLink"><span class="RktSym">scribble/doclang</span></span></a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="docreader.html" class="toclink" data-pltdoc="x">6.7<span class="hspace">&nbsp;</span>Document Reader</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="xref.html" class="toclink" data-pltdoc="x">6.8<span class="hspace">&nbsp;</span>Cross-Reference Utilities</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="tag.html" class="toclink" data-pltdoc="x">6.9<span class="hspace">&nbsp;</span>Tag Utilities</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="blueboxes.html" class="toclink" data-pltdoc="x">6.10<span class="hspace">&nbsp;</span>Blue Boxes Utilities</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="config.html" class="toclink" data-pltdoc="x">6.11<span class="hspace">&nbsp;</span>Extending and Configuring Scribble Output</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="extra-style.html" class="toclink" data-pltdoc="x">6.11.1<span class="hspace">&nbsp;</span>Implementing Styles</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="config-style.html" class="toclink" data-pltdoc="x">6.11.2<span class="hspace">&nbsp;</span>Configuring Output</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="builtin-css.html" class="toclink" data-pltdoc="x">6.11.3<span class="hspace">&nbsp;</span>Base CSS Style Classes</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="manual-css.html" class="toclink" data-pltdoc="x">6.11.4<span class="hspace">&nbsp;</span>Manual CSS Style Classes</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="builtin-latex.html" class="toclink" data-pltdoc="x">6.11.5<span class="hspace">&nbsp;</span>Base Latex Macros</a></p></td></tr><tr><td><p><span class="hspace">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><a href="latex-prefix.html" class="toclink" data-pltdoc="x">6.11.6<span class="hspace">&nbsp;</span>Latex Prefix Support</a></p></td></tr></table><div class="navsetbottom"><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, &quot;6.7&quot;, &quot;../&quot;);" onfocus="this.style.color=&quot;black&quot;; this.style.textAlign=&quot;left&quot;; if (this.value == &quot;...search manuals...&quot;) this.value=&quot;&quot;;" onblur="if (this.value.match(/^ *$/)) { this.style.color=&quot;#888&quot;; this.style.textAlign=&quot;center&quot;; this.value=&quot;...search manuals...&quot;; }"/></form>&nbsp;&nbsp;<a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot(&quot;6.7&quot;);">top</a></span><span class="navright">&nbsp;&nbsp;<a href="lp.html" title="backward to &quot;5 Literate Programming&quot;" data-pltdoc="x">&larr; prev</a>&nbsp;&nbsp;<a href="index.html" title="up to &quot;Scribble: The Racket Documentation Tool&quot;" data-pltdoc="x">up</a>&nbsp;&nbsp;<a href="layers.html" title="forward to &quot;6.1 Scribble Layers&quot;" data-pltdoc="x">next &rarr;</a></span>&nbsp;</div></div></div><div id="contextindicator">&nbsp;</div></body></html>