docs: def append(self, name, data):
              """Append 'data' to the current node d_data
  
              This method appends 'data' to the current contents in the
              key named 'name'. The append assumes that the operation
              makes sense and that the data types can be appended to
              each other.
  
              """
              b_OK = True
              self.snode_current.d_data[name] = self.snode_current.d_data[name] + data
              return b_OK