[liblouis-liblouisxml] Re: Display opcode versus normal character opcodes

John,

I am looking at the latest version of the Czech table. What is the purpose
of including the *.uti files if those characters are already defined in the
text_nabcc.dis file which is included? These included definitions will just
be superseded by the ones in the text_nabcc.dis file, right?



Best regards from Ohio, U.S.A.,

Vic
E-mail: vic.beckley3@xxxxxxxxx


-----Original Message-----
From: liblouis-liblouisxml-bounce@xxxxxxxxxxxxx
[mailto:liblouis-liblouisxml-bounce@xxxxxxxxxxxxx] On Behalf Of John J.
Boyer
Sent: Wednesday, June 27, 2012 8:38 AM
To: liblouis-liblouisxml@xxxxxxxxxxxxx
Subject: [liblouis-liblouisxml] Re: Display opcode versus normal character
opcodes

Hi Vic,

I know you have to work with some old tables. They are often not well 
written. However, to get to the main point, the character-definition 
opcodes should be used to define the dot patterns that are prevalent in 
your country. If they are used correctly display opcodes are not needed. 
However, suppose that you are using an embosser built in another country 
that uses a different mappikng between characters and dot patterns. Then 
you need the display opcode to specify this mapping. .dis files must be 
included at the beginning of a table or must be the first file in a 
table list. The dot patterns which are defined in such a file take 
precedence over those defined in character-definition opcodes such as 
uplow, digit, space, sign, etc. .dis files do not specify any 
translations, just which dots go with which characters.O


Incidentally, it is advisable to use uplow in its full form for defining 
characters that have both an upper and a lowercase form. For example:

uplow Aa 17,1

John

On Wed, Jun 27, 2012 at 07:41:41AM -0400, Vic Beckley wrote:
> Hi all,
> 
> I am confused about the purpose of the display opcode. Here are my
> questions:
> 
> What is the purpose of the display opcode as opposed to using the uplow or
> other similar character definition opcodes?
> 
> Why would a table include text_nabcc.dis which defines all the character
> codes and then include latinLettDef6Dots.uti and digits6Dots.uti which
> includes the same characters? Which would take precedence if they were
> defined differently?
> 
> If a table included text_nabcc.dis and then proceeded to define the letter
> W, for example, in the table, which definition would be used? Would it
cause
> an error if they were different?
> 
> Thanks for any help.
> 
> 
> Best regards from Ohio, U.S.A.,
> 
> Vic
> E-mail: vic.beckley3@xxxxxxxxx
> 
> 
> 
> 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

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