title: Select elements with attribute data-url using HTMLAgilityPack
body: <p>I'm writing a little Download-Roboter, that is searching for links in lower layers for it self. </p>
  
  <p>What i need to find are all links in an html-Page (the links to .jpg files as well as the links to .pgn, .pdf, .html,.... - files)</p>
  
  <p>I´m using the html-agilitypack to find all a-href links. </p>
  
  <p>Sample code:</p>
  
  <pre><code>foreach (HtmlNode link in htmlDocument.DocumentNode.SelectNodes("//a[@href]"))
  {
      HtmlAttribute attribute = link.Attributes["href"];
      links.Add(attribute.Value);
  }
  </code></pre>
  
  <p>But i want to find the data-urls as well. </p>
  
  <p>What XPath-syntax do i have to use to find data-urls. An example data-url in an htmlcode:</p>
  
  <pre><code>    &lt;div class="cbreplay" data-url="2012\edmonton\partien.pgn"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>I need the "2012\edmonton\partien.pgn" out of this example. How can i realize this with XPath syntax?</p>
  
  <p>Best greetings, if i made some bad mistakes, tell me. This is my first question ever.</p>