UTS #10 Unicode Collation Algorithm is defined with a particular base version of the Unicode Standard, but I am using characters from a later version of Unicode. What shall I do?
You can update to a later version of the Unicode Collation Algorithm, which will update its base version to the latest version of the Unicode Standard itself. The UTC is committed to ensuring that the Unicode Collation Algorithm is updated in a timely manner, so that the repertoire of characters in the Default Unicode Collation Element Table stays in synch with the Unicode Standard. However, if you need to stay with a particular version of the Unicode Collation Algorithm for any reason, such as maintaining binary compatibility of generated key weights, note that the algorithm does assign a default sorting order to every valid code point, assigned or unassigned. Any characters that are not defined in the base version repertoire will be given derived, implicit weights in code point order after all of the assigned characters. See 7.1 Derived Collation Elements for more details.
