On 2/21/17 10:40 AM, John C Klensin wrote: > How would you > feel about making the phrase something closer to "the basic > Latin repertoire, i.e., the letters and digits of ASCII as > described above" and moving the RFC 20 citation to the first use > of "ASCII" in that previous paragraph? OLD In order to make URNs as stable and persistent as possible when protocols evolve and the environment around them changes, URN namespaces SHOULD NOT allow characters outside the basic Latin repertoire [RFC20] unless the nature of the particular URN namespace makes such characters necessary. NEW In order to make URNs as stable and persistent as possible when protocols evolve and the environment around them changes, URN namespaces SHOULD NOT allow non-ASCII characters [RFC6365] unless the nature of the particular URN namespace makes such characters necessary. The term "non-ASCII" is defined in RFC 6365 and seems perfectly appropriate here. Peter