title: How to select nested elements using HTML agility pack?
body: <p>I have a following kind of xml/html</p>
  
  <pre><code>&lt;root&gt;
  &lt;p1&gt;
      &lt;l1&gt;
          &lt;a&gt;something&lt;/a&gt;
          &lt;a&gt;something&lt;/a&gt;
          &lt;a&gt;something&lt;/a&gt;
          &lt;a&gt;something&lt;/a&gt;
      &lt;/l1&gt;
      &lt;l1&gt;
          &lt;a&gt;something&lt;/a&gt;
          &lt;a&gt;something&lt;/a&gt;
          &lt;a&gt;something&lt;/a&gt;
          &lt;a&gt;something&lt;/a&gt;
      &lt;/l1&gt;
  &lt;/p1&gt;
  &lt;/root&gt;
  </code></pre>
  
  <p>I want to select collection of l1 tags and for each l1 tag i want to select all the 'a' tags for the current l1 tag. how do i do it??</p>