Hello all, The functions \cs_get_arg_count_from_signature:N and \cs_split_function:NN have been move to 'internal' status, and so may be renamed or dropped in the future without notice. These functions are not used outside of the kernel in a current TeX Live installation. The functions \cs_get_function_name:NN and \cs_get_function_signature:NN are deprecated, and will be removed from expl3 by 2012-08-31. These functions are entirely unused in a current TeX Live installation. -- Joseph Wright