On 19 Aug 2011, at 15:13, Doug Ewell wrote: > The PUA is supposed to be a free and open sandbox, without reserved or > allocated zones.
Nevertheless, inherent directionality is something that computers take notice of. There would be no harm in having a RTL PUA area. > My question would be why the PUA is designated as 'L' by default at all, > instead of, say, 'ON'. Since it is, there is a need for an 'R' area. I can think of several scripts in the CSUR which could make use of that, for instance. > So your private agreement, in addition to specifying the meaning of your > PUA characters and probably some sample glyphs, can also specify their > properties, overriding the default properties. Gods know I wouldn't have any idea how to get my operating system to honour such a declaration. > But these lines in > UnicodeData.txt: > > E000;<Private Use, First>;Co;0;L;;;;;N;;;;; > F8FF;<Private Use, Last>;Co;0;L;;;;;N;;;;; > > do present the impression that these code points are somehow reserved > for strong-LTR characters, and also for non-reordrant characters (i.e. > no combining marks), neither of which is true. Indeed. > There's a lot of misinformation and FUD about the PUA, and unfortunately > I expect at least one response of the form "The PUA is evil, don't use > it," which accomplishes very little. I just think we need some PUA that's RTL. Michael Everson * http://www.evertype.com/
