title: How to select all nodes using xmllint where node on same level has certain value?
body: <p>Consider the following <code>example.xml</code> file</p>
  
  <pre><code>&lt;all&gt;
    &lt;item&gt;
      &lt;name&gt;foo&lt;/name&gt;
      &lt;value&gt;5&lt;/value&gt;
      &lt;readonly&gt;true&lt;/readonly&gt;
    &lt;/item&gt;
    &lt;item&gt;
      &lt;name&gt;boo&lt;/name&gt;
      &lt;value&gt;2&lt;/value&gt;
      &lt;readonly&gt;false&lt;/readonly&gt;
    &lt;/item&gt;
    &lt;item&gt;
      &lt;name&gt;bar&lt;/name&gt;
      &lt;value&gt;9&lt;/value&gt;
      &lt;readonly&gt;true&lt;/readonly&gt;
    &lt;/item&gt;
  &lt;/all&gt;
  </code></pre>
  
  <p>I would like to list <code>foo</code> and <code>bar</code> because they are <code>readonly</code> items. This didn't work out for me:</p>
  
  <pre><code>cat example.xml | xmllint --xpath "all/item[readonly/text() = "true"]/name" -
  </code></pre>
  
  <p>I received:</p>
  
  <pre><code>XPath set is empty
  </code></pre>