    # File lib/metacat.rb, line 161
      def logout
        response = metacat_get({
          'action'    =>  'logout',
          'qformat'   =>  'xml'
        })
        if(response.content_type == 'text/xml')
          doc = REXML::Document.new(response.read_body)
          if doc.root.name = 'logout'
            @cookie = false
            return true
          else
            raise 'Failed to logout: '+doc.root.text
          end
        else
          raise MetacatResponseError
        end
      end