Hello List, Merry Christmas and a Happy New Year in advance. I want to apply the function '\exp_args:Ncnn' to '\fontspec_set_family:Nnn <family-passed-as-list-of-strings> <feature> <font>'. Please note the family name is defined as a variable l__..._tl. The reason that I want to 'Ncnn' (I think) is that the argument specification of the function '\fontspec_set_family' is 'Nnn'. However, there is no argument specification 'Ncnn' in the signature of '\exp_args'. Also as I understand from the LaTeX3 documents it is not possible to create such a variant for this function with '\cs_generate_variant:Nn'. Furthermore, as '\exp_args_generate:n' is defined in 'l3candidates' which is experimental, at the moment I have decided to use the following: \exp_args:Ncnx \fontspec_set_family:Nnn <family-passed-as-list-of-strings> <feature> <font>' Is it correct to use 'Ncnx' instead of 'Ncnn'? What is the best argument specification to use instead of 'Ncnx' here? Thanks, Tisha