code: def clone_node(self, node):
          
          if isinstance(node, xml4h.nodes.Node):
              child_impl_node = node.impl_node
          else:
              child_impl_node = node  # Assume it's a valid impl node
          self.adapter.import_node(self.impl_node, child_impl_node, clone=True)
docs: Clone a node from another document to become a child of this node, by
          copying the node's data into this document but leaving the node
          untouched in the source document. The node to be cloned can be
          a :class:`Node` based on the same underlying XML library implementation
          and adapter, or a "raw" node from that implementation.
  
          :param node: the node in another document to clone.
          :type node: xml4h or implementation node