def get_data_node(self):
if not self._storage_service.is_open:<EOL><INDENT>warnings.warn('<STR_LIT>'<EOL>'<STR_LIT>',<EOL>category=RuntimeWarning)<EOL><DEDENT>return self._request_data('<STR_LIT>')<EOL>
Returns the actula node of the underlying data.

        In case one uses HDF5 this will be the HDF5 leaf node.