paramspec = OPT inverter_param_list ;
outsort = OPT [ SYMBOL ":" ; outsort = term -> outsort ] ->
G.NInverter (loc,name,indty,paramspec,outsort)
paramspec = OPT inverter_param_list ;
outsort = OPT [ SYMBOL ":" ; outsort = term -> outsort ] ->
G.NInverter (loc,name,indty,paramspec,outsort)