structure represents a set of attributes to check in a call
to <code>git_check_attr()</code> function, and receives the results.</p>
</dd>
</dl>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_attribute_values">Attribute Values</h2>
<div class="sectionbody">
<div class="paragraph">
<p>An attribute for a path can be in one of four states: Set, Unset,
Unspecified or set to a string, and <code>.value</code> member of <code>struct
git_attr_check</code> records it.  There are three macros to check