Re: How do we find out what assigned code points aren't normally used in text?

From: Karl Williamson <>
Date: Fri, 09 Sep 2011 17:25:33 -0600

On 09/09/2011 02:36 PM, Kent Karlsson wrote:
> Den 2011-09-09 21:24, skrev "Karl Williamson"<>:
>> On 07/06/2011 04:23 PM, Ken Whistler wrote:
>>> I'm not sure whether the FB05/FB06 instance is important enough to add
>>> or not. Neither of those compabitility ligatures should ordinarily be used
>>> in text, anyway ...
>>> --Ken
>> I'm wondering what other characters might not ordinarily be used in
>> text, or how to discover which ones aren't. We're discovering that
>> getting these ligatures to work is quite hard, and it would be nice to
> How do you mean "getting these ligatures to work"? These particular
> ligatures would be formed (automatically) by specialty fonts only.
> Not for "run of the mill" fonts. There are several other ligatures
> that *should* be formed (automatically) by "run of the mill" fonts:
> for instance the "fj" ligature, just to mention one that I find
> particularly important (and that does not have a compatibility code
> point).
> Neither for "run of the mill" ligatures (like "fi", "fl", fj", "ft",...)
> nor for specialty ligatures (like ligature of long s and t, or any
> other ligature with long s) should the compatibility code points be
> used. One reason in particular is that (compatibility) code points
> exist only for a small subset of such ligatures. And that will remain
> true, since Unicode/10646 will not allocate code points for any more
> (typographic) ligatures. The ones already encoded are for compatibility
> only.
> Note that I am here referring to purely *typographic* ligatures.
> *Not* to ligatures that have "graduated" to letter (like or ) or
> orthographic (like ) status. (I realise that LAM-ALEPH ligatures
> would be borderline from this description, but the consensus is
> not to use any of the LAM-ALEPH ligature *characters*, but regard
> it as a required typographic ligatures of character pairs.)
> /Kent K
>> know where it's really appropriate to expend the implementation effort.

Sorry that I took out too much of the original context. This is about
implementing the Case_Folding property.
Received on Fri Sep 09 2011 - 18:29:40 CDT

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