The keyboard interfaces and protocols in X

[John Found]

On Tue, 15 Feb 2022 14:29:05 +0000
Dave Howorth <xorg at howorth.org.uk> wrote:

> On Tue, 15 Feb 2022 15:21:07 +0200
> John Found <johnfound at asm32.info> wrote:
> 
> > What is the meaning of the fields in the following structure, in the
> > XkbGetMap reply:
> > 
> > KB_KEYSYMMAP     8+4n
> > 4     LISTofCARD8    ktIndex      ; What is this?
> > 1     CARD8          groupInfo    ; What is this?    
> > 1     CARD8          width        ; Width of what?
> > 2     n              nSyms        ; more or less clear
> > 4n    LISTofKEYSYM          syms  ; clear as well.  
> 
> Oh, and assuming you found this in the XKB Protocol Specification then
> the answers to your question are in the same document, I think. For
> example groupInfo is explained on p32. Just search the document.

Please, could you explain it on this example:

01  14  00  00  = ktIndex   - what this means?
02              = groupInfo - what info?
04              = width     - of what?
08  00          = 8 keysyms follow
34  00  00  00  = "4"
24  00  00  00  = "$"
00  00  00  00  = NULL
00  00  00  00  = NULL
34  00  00  00  = "4"
24  00  00  00  = "$"
AC  20  00  00  = "€" (euro sign)
AC  20  00  00  = "€" (euro sign)

What the constants 0x01, 0x14 (ktIndex), 0x02 (groupInfo) and 
0x04 (width) means?

Thanks.
John Found