#NEWLINE# def data_variable_names( self ) : #NEWLINE# #INDENT# result = mds . ordered_set . OrderedSet ( ) #NEWLINE# for variable_name in variable_name . dataset . variables : #NEWLINE# #INDENT# if self . is_data_variable ( variable_name ) : #NEWLINE# #INDENT# result . add ( variable_name ) #NEWLINE# #UNINDENT# #UNINDENT# return result