title: XPath to find last text node in element
body: <p>How can I select the last text in element <code>a</code>?</p>
  
  <p>The element can have children elements.</p>
  
  <pre><code>&lt;a&gt;bla di bla &lt;b&gt;foo bar&lt;/b&gt; yes!&lt;/a&gt;
  </code></pre>
  
  <p>should give me "yes!" and</p>
  
  <pre><code>&lt;a&gt;bla di bla &lt;b&gt;foo bar&lt;/b&gt;&lt;/a&gt;
  </code></pre>
  
  <p>should give me "foo bar" and</p>
  
  <pre><code>&lt;a&gt;bla di bla&lt;/a&gt;
  </code></pre>
  
  <p>should give me "bla die bla"</p>