code: protected boolean popNamespace(String prefix)
      {
          try
          {
              if (m_prefixMap.popNamespace(prefix))
              {
                  m_saxHandler.endPrefixMapping(prefix);
                  return true;
              }
          }
          catch (SAXException e)
          {
              // falls through
          }
          return false;
      }
docs: Undeclare the namespace that is currently pointed to by a given
  prefix. Inform SAX handler if prefix was previously mapped.