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<h1>Links and Bookmarks</h1>
<h2>Glyph</h2>
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<nav class="navigation"><a href="/glyph/book/text_editing/topics.html">Topics</a> | <a href="/glyph/book/index.html">Contents</a> | <a href="/glyph/book/text_editing/images.html">Images and Figures</a></nav>
<p>Lightweight markups let you create internal and external links in a very easy way, and you can still do so in Glyph. However, if you do so:</p>
<ul>
<li>you can’t check if they are valid</li>
<li>you can’t infer the link title automatically</li>
</ul>
<p>If you care about link validation and you want to save some keystrokes, then you should use:</p>
<ul>
<li>the <a href="/glyph/book/macros/macros_inline.html#m_link"><code>link</code></a> macro (aliased to <code>=></code>) — to create internal and external links.</li>
<li>the <a href="/glyph/book/macros/macros_inline.html#m_anchor"><code>anchor</code></a> macro (aliased to <code>#</code>) — to create named anchors (bookmarks) within your document.</li>
</ul>
<aside class="box">
<div class="box-title">Example</div>
<p>
The following Glyph code:
</p>
<div class="CodeRay">
<div class="code"><pre><span class="no">1</span> This is a link to link[#test].
<span class="no">2</span> ...
<span class="no">3</span> This is link[#wrong].
<span class="no">4</span> This is a #[test|test anchor].</pre></div>
</div>
<p>
Is translated into the following HTML code:
</p>
<div class="CodeRay">
<div class="code"><pre><span class="no">1</span> <span class="ta"><p></span>This is a link to <span class="ta"><a</span> <span class="an">href</span>=<span class="s"><span class="dl">"</span><span class="k">#test</span><span class="dl">"</span></span><span class="ta">></span>test anchor<span class="ta"></a></span>.<span class="ta"></p></span>
<span class="no">2</span> <span class="ta"><p></span>...<span class="ta"></p></span>
<span class="no">3</span> <span class="ta"><p></span>This is <span class="ta"><a</span> <span class="an">href</span>=<span class="s"><span class="dl">"</span><span class="k">#wrong</span><span class="dl">"</span></span><span class="ta">></span>#wrong<span class="ta"></a></span>.<span class="ta"></p></span>
<span class="no">4</span> <span class="ta"><p></span>This is a <span class="ta"><a</span> <span class="an">id</span>=<span class="s"><span class="dl">"</span><span class="k">test</span><span class="dl">"</span></span><span class="ta">></span>test anchor<span class="ta"></a></span>.<span class="ta"></p></span></pre></div>
</div>
<p>Additionally, the following warning message is displayed when <a href="/glyph/book/compiling/compiling.html#compile">compiling</a>:</p>
<div class="CodeRay">
<div class="code"><pre><span class="no">1</span> warning: Bookmark 'wrong' does not exist
<span class="no">2</span> -<span class="er">></span> source: @: authoring.textile
<span class="no">3</span> -<span class="er">></span> path: document/body/bodymatter/chapter/@/textile/section/section/box/link</pre></div>
</div>
</aside>
<p>Basically, if you use the <a href="/glyph/book/macros/macros_inline.html#m_link"><code>link</code></a> macro and the <a href="/glyph/book/macros/macros_inline.html#m_anchor"><code>anchor</code></a> macro, Glyph makes sure that:</p>
<ul>
<li>all links point to valid anchors within the document (regardless if the anchors are before or after the link, in snippets or included files).</li>
<li>there are no duplicate anchors within the documents.</li>
<li>if no title is specified as second parameter for the <a href="/glyph/book/macros/macros_inline.html#m_link"><code>link</code></a> macro, the anchor’s name is used as such.</li>
</ul>
<p>Besides using the <a href="/glyph/book/macros/macros_inline.html#m_anchor"><code>anchor</code></a> macro, you can also create an anchor for a header by passing an <code>@id</code> attribute the the <a href="/glyph/book/macros/macros_structure.html#m_section"><code>section</code></a> macro, like this:</p>
<div class="CodeRay">
<div class="code"><pre><span class="no">1</span> section[
<span class="no">2</span> @title[My Section]
<span class="no">3</span> @id[my_section]
<span class="no">4</span> ...
<span class="no">5</span> ]</pre></div>
</div>
<p>By default, validation is only enabled for internal links (i.e. the check occurs if the first parameter of the <a href="/glyph/book/macros/macros_inline.html#m_link"><code>link</code></a> macro starts with a <code>#</code>). You can enable it for external links as well by setting the <a href="/glyph/book/config/options.html#s_options_url_validation"><code>options.url_validation</code></a> setting to <code>true</code>. If URL validation is enabled, an error is returned if a link returns an HTTP status greater than 302.</p>
<aside class="important">
<span class="note-title">Important</span>Enabling URL validation may significantly slow down compilation if a lot of external links are present.
</aside>
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