title: Google Spreadsheet ImportXML error #NA not received any data as a result of XPath queries
body: <p>I have a problem with scraping one website - <a href="http://allegro.pl/samochody-149" rel="nofollow">motoallegro</a></p>
  
  <p>I want to get title of all ads in this <a href="http://allegro.pl/samochody-149?order=qd&amp;string=Primera%20GT&amp;search_scope=automotive&amp;department=automotive" rel="nofollow">page</a></p>
  
  <p>So I set formula in google spreadsheet:</p>
  
  <pre><code>=ImportXML("http://allegro.pl/samochody-149?order=qd&amp;string=Primera+GT&amp;search_scope=automotive&amp;department=automotive";"//header/h2/a/span")
  </code></pre>
  
  <p>This formula always return #NA error: not received any data as a result of XPath queries</p>
  
  <p>But if I try to get other data from the same page, for example H1 text:</p>
  
  <pre><code>=ImportXML("http://allegro.pl/samochody-149?order=qd&amp;string=Primera+GT&amp;search_scope=automotive&amp;department=automotive";"//h1/span")
  </code></pre>
  
  <p>The result is correct: "Primera GT"</p>
  
  <p>I want to add, that xPath rule - //header/h2/a/span IS CORRECT. I tested it on few firefox xPath plugins.</p>
  
  <p>Any ideas, why google spreadsheet formula ImportXML with correct xPath rule not return correct data?</p>