docs: def export(self, filename, exporter=None):
          """
          Exports the data from this tree to the given filename.
          
          :param      filename | <str>
          """
          filename = nativestring(filename)
          if exporter is None:
              ext = os.path.splitext(filename)[1]
              exporter = self.exporter(ext)
          
          if exporter:
              return exporter.exportTree(self, filename)
          else:
              return False