Maybe I'm just confused, but my memory is that official US 6-dot computer braille does not distinguish upper and lower case letters. To get that distinction it is necessary to use the 8 dot code. If I'm right, then this table may be producing something sensible, but it is not official computer braille. John G -----Original Message----- From: liblouis-liblouisxml-bounce@xxxxxxxxxxxxx [mailto:liblouis-liblouisxml-bounce@xxxxxxxxxxxxx] On Behalf Of John J. Boyer Sent: Friday, February 17, 2012 6:22 AM To: liblouis-liblouisxml@xxxxxxxxxxxxx Subject: [liblouis-liblouisxml] Re: Question about english computer braille tables Hi Yuemei, The tables are ok. The comp6 opcode overrides uplow, so en-us-comp6.ctb will produce the dot pattern 456-1 for uppercase a. John On Thu, Feb 16, 2012 at 10:22:49AM -0800, Yuemei Sun wrote: > Hi, John, > > Thank you for the explanation. For the en-us-comp6.ctb, there are two > places that mention the A, one is "uplow Aa 17,1", the other is "comp6 A > 456-1". The "uplow Aa" is not defined as "456-1,1"as you mentioned. Is > the table in SVN repository for en-us-comp6.ctb not updated? > > Thanks, > Yuemei > > On 2/14/2012 2:09 PM, John J. Boyer wrote: > >I decided to check this out. Hopefully others will have comments also. > >The general question is which tables are for computer braille. There may > >be different computer braille tables for different languages. Some of > >the g0 tables seem to be for computer braille. > > > >Of the U.S. English tables, en-us-compbrl.ctb should probably be > >ignored. en-us-comp8.ctb contains 8-dot computer braille. Uppercase > >letters have dot 7 added to the dots for the lowercase letters. In U.S. > >English computer braille uppercase letters require two cells. They are > >preceded by dots 456. Thus in en-us-comp6.ctb we have the entry > > > >uplow Aa 456-1,1 > > > >John > > > > > > > >On Tue, Feb 14, 2012 at 10:33:00AM -0800, Yuemei Sun wrote: > >>Can anybody explain the use of the three American English braille > >>tables, en-us-comp6.ctb, en-us-comp8.ctb, and en-us-compbrl.ctb? I > >>looked at the table, it looks to me that only the en-us-comp6.ctb has > >>entries defining 8 dot compuer braille for upper case letters. The same > >>table also has "comp6 A 456-1" entry. In this case, what will upper > >>case A be translated into, one cell with dot patter 17, or two cells > >>with pattern "456-1"? In other words, what table should I use if I want > >>6-dot US computer braille, and what table is for 8-dot US computer > >>braille? > >> > >>Thanks, > >> > >>-- > >>Yuemei Sun > >> > >>Software Engineer > >>yuemei.sun@xxxxxxxxxxxx > >>541-754-4002 ext 229 > >> > >>For a description of the software, to download it and links to > >>project pages go to http://www.abilitiessoft.com > > -- > Yuemei Sun > > Software Engineer > yuemei.sun@xxxxxxxxxxxx > 541-754-4002 ext 229 > > For a description of the software, to download it and links to > project pages go to http://www.abilitiessoft.com -- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities For a description of the software, to download it and links to project pages go to http://www.abilitiessoft.com For a description of the software, to download it and links to project pages go to http://www.abilitiessoft.com