code: def leaf(self, node, elem, module, path):
          
          if node.i_default is None:
              nel, newm, path = self.sample_element(node, elem, module, path)
              if path is None:
                  return
              if self.annots:
                  nel.append(etree.Comment(
                      " type: %s " % node.search_one("type").arg))
          elif self.defaults:
              nel, newm, path = self.sample_element(node, elem, module, path)
              if path is None:
                  return
              nel.text = str(node.i_default_str)
docs: Create a sample leaf element.