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

[Akshat Joshi]

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.

/---%Te//xt begin//s//%----/

*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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