[Neobrahmigp] Text for inclusion of Ttha Cross-script variants in Malayalam and Odia (Oriya) LGR documents

[Akshat Joshi]

Dear All,

As discussed, please find attached, the proposed text that both the Odia (Oriya)
and Malayalam teams may consider adding to their respective LGR documents
towards justifying the inclusion of the single character Consonant TTHA as
variant.

I have added both the following aspects in the current reasoning:
1. Relatedness of the scripts and thereby limiting the scope only to the NBGP
scripts
2. Impracticality of carrying out the cross-script variant analysis between all
the script under the Root LGR procedure.


Regards,
Akshat


On July 11, 2018 at 3:43 PM Akshat Joshi <akshatj at cdac.in> wrote:

> 
>  Dear All,
> 
>  As discussed in yesterday's call, here is the proposed text that both the
> Odia (Oriya) and Malayalam teams may consider adding to their respective LGR
> documents towards justifying the inclusion of the single character Consonant
> TTHA as variant. Please go through the text carefully. I have included
> implicit agreement with the subsequent IP decision on the same. Whether to add
> the same or not can be discussed on the call later today.
> 
>  ---%Text begins%----
> 
>  NBGP Cross-script Variant inclusion policy:
> 
>  If, in any two given scripts, all the potential cross-script variants consist
> of dependent (e.g. Vowel Signs, Anusvara, Visarga, Chandrabindu etc)
> characters ONLY, then that entire set can be ignored and no cross-script
> variants be proposed between those two scripts.
> 
>  If, in any two given scripts, there is AT LEAST ONE non-dependent (e.g.
> Consonant, Vowel etc) cross-script variant character/sequence present, all the
> potential cross-script variants be considered and proposed between the two
> scripts.
> 
> 
>  Case of Malayalam and Odia (Oriya) TTHA Consonant:
> 
>  There are two proposed single character cross-variants between Malayalam and
> Odia, those are:
> 
>  ഠ - MALAYALAM LETTER TTHA (U+0D20)
>  ଠ - ORIYA LETTER TTHA (U+0B20)
> 
>  Both the characters, look exactly alike and belong to a "Consonant" category.
> As they are consonants, each of them, even in the simplest form i.e. the
> characters themselves, are valid labels. As per the NBGP cross-script variant
> inclusion policy, this is a valid case for inclusion. Also, even if they are
> single characters, when the same character combines, theoretically they can
> form infinite* number of cross-script variant labels between the scripts
> involved. Here are some samples of some of those labels:
> 
>  Malayalam
>  Oriya
>  ഠഠഠ
>  U+0D20 U+0D20 U+0D20
>  ଠଠଠ
>  U+0B20 U+0B20 U+0B20
>  ഠഠഠഠ
>  U+0D20 U+0D20 U+0D20 U+0D20 	ଠଠଠଠ
>  U+0B20 U+0B20 U+0B20 U+0B20
>  ഠഠഠഠഠ
>  U+0D20 U+0D20 U+0D20 U+0D20 U+0D20 	ଠଠଠଠଠ
>  U+0B20 U+0B20 U+0B20 U+0B20 U+0B20
> 
>  Since, having such labels is a realistic possibility and the corresponding
> labels look almost exactly alike,  NBGP has proposed them as blocked variants.
> NBGP also understands that this shape is quite generic and may have parallels
> in other scripts not under the ambit of NBGP. Since NBGP does not have any
> exposure in terms of actual usage of those characters in those particular
> scripts, NBGP desisted from including them. However, by proposing them as
> "blocked" variants, NBGP has taken the most conservative approach, which is
> ingrained in the LGR procedure. If, in future, this recommendation is in
> conflict with any other new script being added to the RZ-LGR, it is envisioned
> that the most conservative approach would prevail and the recommendation of
> blocking would still hold good**.
> 
>  * Though theoretically infinite, this number would be limited to the number
> of such labels whose equivalent punycode string would not exceed 63 characters
> including the ACE prefix "xn--".
> 
>  ** NBGP however, understands that the final decision of including the same in
> the cross-script variant set, depends on the Integration Panel and plans to
> abide by it.
> 
>  ---%Text ends%----
> 
>  -- Regards, Akshat Joshi C-DAC GIST
> 
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