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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boostbook.together"></a>Bringing Together a BoostBook Document</h2></div></div></div>
<div class="toc"><dl class="toc"><dt><span class="section"><a href="together.html#boostbook.linking">Linking in BoostBook</a></span></dt></dl></div>
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<div class="titlepage"><div><div><h3 class="title">
<a name="boostbook.linking"></a>Linking in BoostBook</h3></div></div></div>
<p>How one links to another element in BoostBook depends
greatly on the nature of the element linked and how the link
should appear. There are three general linking elements:
<xref>, <link>, and <ulink>. Additionally, there
are linking elements for referencing specific types of entities,
such as classes (<classname>), functions
(<functionname>), or libraries (<libraryname>).</p>
<p>The <xref> element references elements that have an
<code class="computeroutput">id</code> attribute and a title. The actual link text is
composed from title and type of the element referenced. To link to
a particular ID, create an <xref> element with the
<code class="computeroutput">linkend</code> attribute set to the ID of the intended
target. For instance, this section's ID is
<code class="computeroutput">boostbook.linking</code>, so we create a reference it to
with <code class="computeroutput"><xref linkend="boostbook.linking"/></code>, which
will look like this in the text: <a class="xref" href="together.html#boostbook.linking" title="Linking in BoostBook">the section called “Linking in BoostBook”</a>.</p>
<p>The <link> element references an ID in the same way as
<xref>, except that <link> does not generate any text
for the link, so text must be supplied within the element. For
instance, we can again link to this chapter but this time specify
our own text with <code class="computeroutput"><link
linkend="boostbook.linking">like this</link></code>. This
markup will result in a link to this chapter that looks <a class="link" href="together.html#boostbook.linking" title="Linking in BoostBook">like this</a>.</p>
<p>The <ulink> element references a URL that is outside
of the DocBook document. The <code class="computeroutput">url</code> attribute contains
the URL to link to, and the element data provides the link
text.For instance, we can link to the the Boost web site with
<code class="computeroutput"><ulink
url="http://www.boost.org">Boost</ulink>,</code> which
appears in the document like this: <a href="http://www.boost.org" target="_top">Boost</a>.</p>
<p>In BoostBook, <ulink> supports a custom url schema for
linking to files within the boost distribution. This is formed by
setting the <code class="computeroutput">url</code> attribute to <code class="computeroutput">boost:</code>
followed by the file's path. For example, we can link to the
flyweight library with
<code class="computeroutput"><ulink
url="boost:/libs/flyweight/index.html">Boost.Flyweight</ulink></code>,
which will appear like this: <a href="../../../libs/flyweight/index.html" target="_top">Boost.Flyweight</a>.
This schema is only supported for BoostBook <ulink> elements.
It isn't available for any other elements or in Docbook.</p>
<p>The <classname>, <functionname>,
<methodname>, and <libraryname> link to classes,
functions, methods, and libraries, respectively. The text of each
element gives both the name of the element to link to and the link
text. For instance, we can link to the Function library with
<code class="computeroutput"><libraryname>Function</libraryname></code>,
which results in the following:
<a class="link" href="../function.html" title="Chapter 16. Boost.Function">Function</a>. In cases where the displayed
text is different from the actual name, the <code class="computeroutput">alt</code>
attribute can be specified. For instance, the following XML
element references the <code class="computeroutput"><a class="link" href="../boost/function.html" title="Class template function">boost::function</a></code>
class template but displays the text <code class="computeroutput"><a class="link" href="../boost/function.html" title="Class template function">function</a></code>: <code class="computeroutput"><classname
alt="boost::function">function</classname></code>.</p>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2005 Douglas Gregor<p>Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
<a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>).
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