code: def _fetchAllChildren(self):
          
          assert self.canFetchChildren(), "canFetchChildren must be True"
  
          childItems = []
  
          # Add fields
          if self._isStructured:
              for fieldName in self._ncVar.dtype.names:
                  childItems.append(NcdfFieldRti(self._ncVar, nodeName=fieldName, fileName=self.fileName))
  
          return childItems
docs: Fetches all fields that this variable contains.
              Only variables with a structured data type can have fields.