title: Trouble using Xpath "starts with" to parse xhtml
body: <p>I'm trying to parse a webpage to get posts from a forum.<br>
  The start of each message starts with the following format  </p>
  
  <pre><code>&lt;div id="post_message_somenumber"&gt;
  </code></pre>
  
  <p>and I only want to get the first one</p>
  
  <p>I tried <code>xpath='//div[starts-with(@id, '"post_message_')]'</code> in yql without success<br>
  I'm still learning this, anyone have suggestions</p>