The proposed RFC (known as an I-D) is now under review by the Independent Submissions Editor. One of his comments is: I think the entire document could benefit from a complete ABNF grammar.? Have a look at RFCs 5234 and 7405. RFC5234 specifies a case insensitive ABNF (Augmented Bachus-Naur Form) for US-ASCII. RFC7405 adds case sensitivity. No Unicode. Do we need a complete ABNF grammar? If so, does anyone have an example? In the long term, will the NUT protocol remain case insensitive? Roger