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<h3 class="section">5.1 Titles</h3>
<p>To easily find a note, a title needs to be prescribed to a note. A note can have
many titles: this allows a note to be referred to by different names, which is
especially useful for topics or concepts with acronyms. For example, for a note
like &ldquo;World War 2&rdquo;, it may be desirable to also refer to it using the acronym
&ldquo;WWII&rdquo;.
</p>
<p>Org-roam calls &lsquo;<samp>org-roam--extract-titles</samp>&rsquo; to extract titles. It uses the
variable &lsquo;<samp>org-roam-title-sources</samp>&rsquo;, to control how the titles are extracted. The
title extraction methods supported are:
</p>
<ol>
<li> &lsquo;<samp>'title</samp>&rsquo;: This extracts the title using the file &lsquo;<samp>#+title</samp>&rsquo; property
</li><li> &lsquo;<samp>'headline</samp>&rsquo;: This extracts the title from the first headline in the Org file
</li><li> &lsquo;<samp>'alias</samp>&rsquo;: This extracts a list of titles using the &lsquo;<samp>#+roam_alias</samp>&rsquo; property.
The aliases are space-delimited, and can be multi-worded using quotes
</li></ol>
<p>Take for example the following org file:
</p>
<div class="example">
<pre class="example">#+title: World War 2
#+roam_alias: &quot;WWII&quot; &quot;World War II&quot;
* Headline
</pre></div>
<table>
<thead><tr><th>Method</th><th>Titles</th></tr></thead>
<tr><td>&lsquo;<samp>'title</samp>&rsquo;</td><td>&rsquo;(&ldquo;World War 2&rdquo;)</td></tr>
<tr><td>&lsquo;<samp>'headline</samp>&rsquo;</td><td>&rsquo;(&ldquo;Headline&rdquo;)</td></tr>
<tr><td>&lsquo;<samp>'alias</samp>&rsquo;</td><td>&rsquo;(&ldquo;WWII&rdquo; &ldquo;World War II&rdquo;)</td></tr>
</table>
<p>One can freely control which extraction methods to use by customizing
&lsquo;<samp>org-roam-title-sources</samp>&rsquo;: see the doc-string for the variable for more
information. If all methods of title extraction return no results, the file-name
is used in place of the titles for completions.
</p>
<p>If you wish to add your own title extraction method, you may push a symbol
&lsquo;<samp>'foo</samp>&rsquo; into &lsquo;<samp>org-roam-title-sources</samp>&rsquo;, and define a
&lsquo;<samp>org-roam--extract-titles-foo</samp>&rsquo; which accepts no arguments. See
&lsquo;<samp>org-roam--extract-titles-title</samp>&rsquo; for an example.
</p>
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