 match info to use if more than one item matches the given name. If None,
the AddAnn action is performed for all match info items with that name.</dd>
<dt><strong><code>silent_fail</code></strong></dt>
<dd>if True and the annotation can not be created for some reason, just do silently nothing,
otherwise raises an Exception.</dd>
</dl></div>
<details class="source">
<summary>
<span>Expand source code</span>
</summary>
<pre><code class="python">class AddAnn:
    &#34;&#34;&#34;
    Action for adding an annota