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content/glyph/book/extending/bookmarks_headers.html

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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
	<head>
		<title>Glyph - Bookmarks and Headers</title>
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						<h2>Bookmarks and Headers</h2>
						<hr />
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							<div class="navigation"><a href="/glyph/book/extending/params_attrs.html">Parameters and Attributes &larr;</a><a href="/glyph/book/index.html">Contents</a><a href="/glyph/book/extending/placeholders.html">&rarr; Using Placeholders</a></div>
								<p>The <a href="http://yardoc.org/docs/h3rald-glyph/Macro"><code>Glyph::Macro</code></a> class also includes a few methods to check and store bookmarks and headers. Consider for example the following source code for the <a href="/glyph/book/macros/macros_inline.html#m_anchor"><code>anchor</code></a> macro:</p>

	<pre class="lazy"><span class="line-numbers">   1 </span> macro <span class="Constant"><span class="Constant">:</span>anchor</span> <span class="Keyword">do </span>
<span class="line-numbers">   2 </span>   ident, title <span class="Keyword">=</span> <span class="Variable"><span class="Variable">@</span>params</span>
<span class="line-numbers">   3 </span>   macro_error <span class="String"><span class="String">&quot;</span>Bookmark '<span class="String"><span class="String">#{</span>ident<span class="String">}</span></span>' already exists<span class="String">&quot;</span></span> <span class="Keyword">if</span> bookmark? ident
<span class="line-numbers">   4 </span>   bookmark <span class="Constant"><span class="Constant">:</span>id</span> =&gt; ident, <span class="Constant"><span class="Constant">:</span>title</span> =&gt; title
<span class="line-numbers">   5 </span>   <span class="String"><span class="String">%{</span>&lt;a id=&quot;<span class="String"><span class="String">#{</span>ident<span class="String">}</span></span>&quot;&gt;<span class="String"><span class="String">#{</span>title<span class="String">}</span></span>&lt;/a&gt;<span class="String">}</span></span>
<span class="line-numbers">   6 </span> <span class="Keyword">end</span>
</pre> 

	<p>The <code>bookmark?</code> method can be used to check the existance of a particular ID within the whole document, while the <code>bookmark</code> method is used to store bookmark IDs and titles. In a similar way, you can use <code>header?</code> and <code>header</code> methods to check the existance of headers within the documents or store new ones.</p>
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