It is inevitable we have to use scientific tools, one of them is the Ausbausprache - Abstandsprache - Dachsprache criterion.
http://en.wikipedia.org/wiki/Ausbausprache_-_Abstandsprache_-_Dachsprache
GerardM you critized the subjectivity of the clause "Sufficiently unique", Why do not add scientifical criteria in the community draft?
C.m.l.