title: Extract/extractValue for tags with a namespace
body: <p>I am trying to extract the value of a tag with a name space in Oracle 10g. My query is</p>
  
  <pre><code>select      extract(xmltype(xml_text),
              '/feed/entry[1]/yt:statistics',
              'xmlns:yt="http://gdata.youtube.com/schemas/2007"') title
  from    edgecast_xml
  where   load_date &gt; sysdate-1
  </code></pre>
  
  <p>and it returns null</p>
  
  <p>The original xml is this (I had to label as htp as opposed to http to avoid links):</p>
  
  <pre><code>&lt;feed xmlns='htp://www.w3.org/2005/Atom' xmlns:media='htp://search.yahoo.com/mrss/' xmlns:openSearch='htp://a9.com/-/spec/opensearch/1.1/' xmlns:gd='htp://schemas.google.com/g/2005' xmlns:yt='http://gdata.youtube.com/schemas/2007' gd:etag='W/&amp;quot;D0YEQH88eSp7I2A9XRZQEU8.&amp;quot;'&gt;
      &lt;entry gd:etag='W/&amp;quot;CUMNRH47eCp7I2A9XRZRGUo.&amp;quot;'&gt;
         &lt;id&gt;tag:youtube.com,2008:video:qXPtXPJLnJY&lt;/id&gt;
         &lt;updated&gt;2014-06-17T02:51:35.000Z&lt;/updated&gt;
         &lt;category scheme='http://schemas.google.com/g/2005#kind' term='http://gdata.youtube.com/schemas/2007#video'/&gt;
         &lt;category scheme='http://gdata.youtube.com/schemas/2007/categories.cat' term='Nonprofit' label='Nonprofits &amp;amp; Activism'/&gt;
         &lt;title&gt;Rear Admiral Lee Addresses Restrictive Regulations on Religious Liberty&lt;/title&gt;
         &lt;gd:rating average='4.8343196' max='5' min='1' numRaters='5239' rel='http://schemas.google.com/g/2005#overall'/&gt;
         &lt;yt:statistics favoriteCount='0' viewCount='365565'/&gt;
         &lt;yt:rating numDislikes='217' numLikes='5022'/&gt;
     &lt;/entry&gt;
  &lt;/feed&gt;
  </code></pre>
  
  <p>Why am I getting null? If I select just /feed/entry[1] it returns xml for everything within the entry tag.</p>