title: CXMLDocument - [CXMLNode nodeForXPath] problem?
body: <p>I'm developing epub reader program. </p>
  
  <p>To get contents of the epub file, I wanted to parse container.xml.</p>
  
  <p>Here it is.</p>
  
  <pre><code>&lt;?xml version="1.0"?&gt;
  &lt;container version="1.0" xmlns="urn:oasis:names:tc:opendocument:xmlns:container"&gt;
      &lt;rootfiles&gt;
      &lt;rootfile full-path="OPS/content.opf"
    media-type="application/oebps-package+xml"/&gt;
  &lt;/rootfiles&gt;
  &lt;/container&gt;
  </code></pre>
  
  <p>I wanted to get  element, so I used following code.</p>
  
  <pre><code>CXMLDocument* manifestFile = [[[CXMLDocument alloc] initWithContentsOfURL:[NSURL fileURLWithPath:manifestFilePath] options:0 error:nil] autorelease];
  
  NSArray* nodes = [manifestFile nodesForXPath:@"//rootfiles" error:nil];
  NSLog(@"Nodes count is %d\n", [nodes count]);
  </code></pre>
  
  <p>And I get the following result.</p>
  
  <pre><code>Nodes count is 0
  </code></pre>
  
  <p>Why do I got this result?</p>
  
  <p>Please help me. </p>
  
  <p>Thanks.</p>