Lars Kristan asked: > Is there a character (codepoint), that is guaranteed to be sorted (collated) > after all other codepoints? > > Like: > > _WantThisOneOnTop > Able > Baker > NoMatterWhat > ^WantThisOneOnBottom > ^^and_so_on > > Where _ is the underscore, which is usually collated 'quite high'. > And ^ is the hipothetical character I am querying about.
ISO/IEC 14651 contains a special symbol "<SFFFF>" which is deliberately left at the end of the list of all other primary-weighted symbols, so that there will be a "highest weight". You would still have to tailor the table, to assign a particular character a high weight making use of <SFFFF> or a weight tailored with respect to <SFFFF>, since there is no highest character, per se, in the list. In the amendment to 14651 under current ballot, <SFFFF> is still present. In the default table, the highest weighted characters before <SFFFF> are the Han characters, so that the last Extension B character would be weighted high. In the Unicode Collation Algorithm (UTS #10), there is no explicit weight assigned corresponding to <SFFFF>, but a primary weight assignment of 0xFFFF is guaranteed to be higher than that of any Han character. (The Han character weights are constructed synthetically based on first element primary weights in the range 0xFF40..0xFFBF.) Once again, if you want a *character* to correspond to that highest weight, then you have to tailor the table to do so. But then, of course, you could assign any character you want to have that highest weight value, including a private use character or even a noncharacter code point. --Ken
