Potentially redundant context rules

[Patrik Fältström]

On 29 jul 2009, at 13.48, Matitiahu Allouche wrote:

> Patrik Fältström asked:
> "What about the other way around?
> Is there anything that is covered by Tables context rules that is NOT
> covered by the Bidi?"
>
> Sure!  The context rules for ZWJ and ZWNJ, Geresh and Gershayim have  
> no
> equivalent in idnabis-bidi-03.txt.

This discussion is about the digits.

> By the way, even the rules for digits overlap between the 2  
> documents but
> are far from identical:
> - In the Tables document, only Arabic-Indic digits and Extended
> Arabic-Indic digits are mutually exclusive (but can coexist with  
> regular
> digits in the same label).
> - In the Bidi document, regular digits (U+0030..U+0039) are mutually
> exclusive with Arabic-Indic digits, while there is no explicit  
> mention of
> Extended Arabic-Indic digits, so by default they will be handled like
> regular digits since they have the same Bidi type (EN).

Ok, so this seems to imply the rules for the digits are definitely not  
the same or redundant, as you say Chris?

    paf

> If we call EN the regular digits, AN the Arabic-Indic digits and XN  
> the
> Extended Arabic-Indic digits, the combinations
>
> - EN and AN is disallowed in Bidi and allowed in the Tables
> - EN and XN is allowed in both documents
> - AN and XN is disallowed in both documents
>
> Seems to me that some more work is needed here.
>
> Shalom (Regards),  Mati
>           Bidi Architect
>           Globalization Center Of Competency - Bidirectional Scripts
>           IBM Israel
>           Phone: +972 2 5888802    Fax: +972 2 5870333    Mobile:  
> +972 52
> 2554160
>
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