On Tue, 16 Oct 2018 11:59:54 +1100 Harshula via Unicode <unicode@unicode.org> wrote:
> Hi Richard, > > On 16/10/18 6:57 am, Richard Wordingham via Unicode wrote: > > On Tue, 16 Oct 2018 02:47:36 +1100 > > Harshula via Unicode <unicode@unicode.org> wrote: > > > >> Note, touching letters are formed by <ZWJ><AL-LAKUNA>, so they > >> should not be displayed as a fallback for <AL-LAKUNA><ZWJ> > >> conjuncts. > > > > I don't follow that. While the conjuncts with r-, -r and -y are > > very different to pairs of touching letters, the conjuncts for tth, > > nd, ndr, ndh, kv and tv would be very similar to the hypothetical > > corresponding touching letters and quite different to the fallbacks > > with visible al-lakuna. > > If you haven't already, it's best you read SLS 1134:2011: > http://www.language.lk/en/download/standards/ > > or the older SLS 1134:2004: > http://unicode.org/wg2/docs/n2737.pdf The latter actually says, in Section 5.8, that <AL-LAKUNA, ZWJ> may be used for either! I suspect that that is a printing error. The Sri Lankan standard simply assumes that the rendering system can accommodate what is requested in the backing store. It says nothing about fallbacks. So, if the user specifies the the syllable ddho written with a conjunct and encoded as ද්ධො but the conjunct is missing from the fonts' repertoires, why is it right to display it with al-lakuna as though it were ද්ධො but wrong to display it with the touching letters encoded as ද්ධො? There are three different correct ways of writing 'ddho', but many systems only support one of them (and some weirdly use a fourth method). Richard.