Peter Constable wrote, > That sounds like a non-conformant use of characters in the U+24xx block.
Non-conformant? Well, it's probably overkill anyway. A simpler method of identifying which PUA convention is being used for a file would be to either have the first line of the file being something like [PUA00001] or to have the file name be something like MYFILE.TXTPUA00001. Where "PUA00001" equals the CSUR. Other numbers (PUA00002, PUA00003, etc.) for other PUA conventions. If a user has thousands of files using PUA characters, and all the files are using the same PUA convention, why would each file need to contain metadata for each PUA character used within? (Rhetorical) The "prior agreement" part about PUA usage means the user would know in advance how to display the text properly.
