From: Doug Ewell (doug@ewellic.org)
Date: Mon Jan 04 2010 - 21:39:58 CST
Karl Pentzlin <karl dash pentzlin at acssoft dot de> wrote:
> DE> How do I access this third level using a standard 101-key
> keyboard, if
> DE> the FDIS leaves the mechanism undefined but suggests a new key?
>
> The mechanisms are defined in another part of the standard, ISO/IEC
> 9995-2 "Alphanumeric Section":
>
>>> 8.3.2 Level 3 select
>>> For keyboards with characters allocated at level 3, at least one
>>> key for the function Level 3 select (frequently
>>> marked "Alt Gr") shall be provided.
>
> AltGr, as you surely know, is found on many keyboards where the "Right
> Alt" is found on US keyboards. Thus, on US keyboards, the "Right Alt"
> is the first choice to employ this function (leaving the "Left Alt"
> for the pure "Alt" function).
OK, we are dealing with the same "group vs. level" terminology problem
that Kent and Michael were talking about. I use AltGr and Shift+AltGr
every day, even though the key just says "Alt" on my U.S. English
keyboard.
What I was trying to say, applied to the FDIS 9995-3 keyboard, was this:
Appendix C shows a new "current common secondary Group layout" which
includes the following key assignments for key D03 (the "E" key):
Level 1 (unshifted): œ U+0153 latin small ligature oe
Level 2 (shifted): ΠU+0152 latin capital ligature oe
Level 3 (extra): ◌̆ U+0306 combining breve
My question was how to reach the so-called "extra" level 3.
> The "Group select" is dealt with in 8.3.3. The "dedicated key" is only
> one of the possibilities described there.
>
> In fact, a "Group select" is nothing else than a "dead key", only that
> the destination character can be any character (specified by the
> layout), rather than being restricted to precomposed character with a
> specific diacritical mark.
> This "dead key" can be a dedicated new key or any free AltGr
> combination on your US keyboard.
OK, that makes things a lot more understandable. I can see now how to
implement this. I just wish it had been made clear before now.
> (It also can be the key combination "Shift+AltGr", to be released
> before the next key pressing rather than to be pressed simultaneously;
> this is recommended but not prescribed in 9995-2 section 8.3.3.)
I already use plain E, Shift+E, AltGr+E, and Shift+AltGr+E. So do most
Windows keyboards. So a fifth level -- or if you prefer, a third level
within the second group -- needs to be something other than
Shift+AltGr+something. If it's conformant to make this, say, AltGr+/
followed by E, then we've got a deal.
-- Doug Ewell | Thornton, Colorado, USA | http://www.ewellic.org RFC 5645, 4645, UTN #14 | ietf-languages @ http://is.gd/2kf0s
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