g_tree">working tree</a> is
associated with just one of them (the "current" or "checked out"
branch), and <a href="#def_HEAD">HEAD</a> points to that branch.</p>
</dd>
<dt class="hdlist1"><a id="def_cache"></a>cache</dt>
<dd>
<p>Obsolete for: <a href="#def_index">index</a>.</p>
</dd>
<dt class="hdlist1"><a id="def_chain"></a>chain</dt>
<dd>
<p>A list of objects, where each <a href="#def_object">object</a> in the list contains
a reference to its successor (for example, the successor of a
<a href="#def_commit