Have you checked out http://www.unicode.org/unicode/faq/indic.html#16?
Mark ————— Γνῶθι σαυτόν — Θαλῆς [For transliteration, see http://oss.software.ibm.com/cgi-bin/icu/tr] http://www.macchiato.com ----- Original Message ----- From: "Ram Viswanadha" <[EMAIL PROTECTED]> To: "Marco Cimarosti" <[EMAIL PROTECTED]>; "Markus Scherer" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Thursday, April 04, 2002 16:43 Subject: Re: Re: Regd- ISCII to Unicode Converter! > Marco, > > > Why do you say that these are not round-trip compatible? > The point I was trying to make is conversion of INV->ZWJ can be thought as > being kind of fallback, you might be able to roundtrip in most cases but > not all. I do agree the conversions you pointed out can be roundtripped. But > does it mean that if I have an ISCII stream, converted it to Unicode would I > be able to render the stream correctly? I think no. > > > Does ISCII have > > VOWEL SIGN VOCALLIC L, VOWEL SIGN VOCALLIC RR, VOWEL SIGN VOCALLIC LL? > > Yes it does in combination with NUKTA. > > 0xAA, 0xE9,/* RI + NUKTA => 0x0960 Vocallic RR*/ > > 0xDF, 0xE9,/* Vowel sign RI + NUKTA => 0x0944 Vowel Sign Vocallic > RR*/ > > 0xa6, 0xE9,/* Vowel I + NUKTA => 0x090C Vowel Vocallic L*/ > > 0xdb, 0xE9,/* Vowel sign I + Nukta => 0x0962 Vowel Sign Vocallic L*/ > > 0xa7, 0xE9,/* Vowel II + NUKTA => 0x0961 Vowel Vocallic LL*/ > > 0xdc, 0xE9,/* Vowel sign II + Nukta => 0x0963 Vowel Sign Vocallic > LL*/ > > 0xa1, 0xE9,/* chandrabindu + Nukta => 0x0950 Om*/ > > 0xEA, 0xE9, /* Danda + Nukta => 0x093D Avagraha*/ > > > > > 4) INV+HALANT+RA => RAsub > > > > I think that there is no reason why ZWJ+HALANT+RA alone shouldn't > represent > > RAsub in Unicode as well. > > Actually, I think that also HALANT+RA alone should be enough to represent > > RAsub (in Unicode, at least). But ZWJ should not harm, so one may retain > it > > for round-trip compatibility with ISCII's INV. > > You are correct if ZWJ is treated like any other consonant, which is unclear > from rendering rules, so > applications have a choice to try and do the right thing or do nothing. > I tried to see how the combinations below are rendered in Notepad on Win2000 > and our Layout demo, and they > donot render HALANT+RA as RAsub > > ISCII Rendered > ==== ======= > KA+INV+HALANT+RA KA |RAsub| /*RAsub does not combine with > KA */ > INV+HALANT+RA RAsub > > Converted to Unicode: > > Unicode Rendered > ====== ======= > KA+ZWJ+HALANT+RA KA |HALANT| RA > ZWJ+HALANT+RA |HALANT|RA > > /* Or even */ > HALANT+RA |HALANT|RA > > Regards, > > Ram > --------------------------------------------------- > Ram Viswanadha > International Components For Unicode > GCoC San Jose > IBM > > >
