title: XPath on an XML document with namespace
body: <p>I'm having this XML document with namespaces and I want to extract some nodes using XPath.</p>
  
  <p>Here's the document:</p>
  
  <pre><code>&lt;ArrayOfAnyType xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/"&gt;
    &lt;anyType xsi:type="Document"&gt;
      &lt;Id&gt;5&lt;/Id&gt;
      &lt;Title&gt;T1&lt;/Title&gt;
    &lt;/anyType&gt;
  
    &lt;anyType xsi:type="Document"&gt;
      &lt;Id&gt;15&lt;/Id&gt;
      &lt;Title&gt;T15&lt;/Title&gt;
    &lt;/anyType&gt;
  &lt;/ArrayOfAnyType&gt;
  </code></pre>
  
  <p>What's the XPath expression going to be if I want to extract all "anyType" elements with xsi:type="Document"?</p>
  
  <p>I've tried this: </p>
  
  <pre><code>//anyType[@xsi:type="Document"]
  </code></pre>
  
  <p>and it doesn't work:</p>