        
  Added in <a href="../../../guide/topics/manifest/uses-sdk-element.html#ApiLevels">API level 1</a>
        
  

      </div>
    <div class="jd-details-descr">
      
  <div class="jd-tagdata jd-tagdescr"><p><p>The official XML attribute used for specifying XML Namespace
 declarations.</p>

 <p>It is <strong><em>NOT</em></strong> valid to use as a
 prefix.  Defined by the XML specification to be
 "<code>xmlns</code>".</p></p></div>
  <div class="jd-tagdata">
      <h5 class="jd-tagtitle">See Also<