mixing different direction labels within same domain

[Harald Alvestrand]

On 06/21/11 07:55, Abdulrahman I. ALGhadir wrote:
>
> Dear all,
>
> I am just wondering whenever it is permitted or not to have this case:
>
> <r2l chars><num1>.<num2>.<etc ..>
>
This particular case has all labels legal, but the overall display name 
will display very oddly (as noted). The oddity is caused by our 
inability to mandate whole-domain tests, as described in the RFC.

It is logical for the administrator of <etc ..> to forbid registration 
of leading-numeric labels if it anticipates R2L labels at the next level 
down, and it is logical for application writers to simply reject such 
names because they are going to confuse the users (much in the spirit of 
Firefox' refusal to do mixed-script names), but the RFC does not require 
them to do so.

> As you know in case r2l labels the display will be like this
>
> <etc..>.<num1>.<num2><r2l chars>
>
I think the display will depend on the direction of <etc> and whether it 
is in an RTL context or an LTR context, but I'm still not confident of 
my ability to execute the BIDI algorithm in my head.
>
> As you see both of them have different display order which isn't  the 
> same as network order.
>
> And I know it is mentioned in the RFC
>
>     Several stronger statements were considered and rejected, because
>     they seem to be*impossible to fulfill within the constraints of the*
> *    Unicode bidirectional algorithm*.
>
> And one of the statement is
>
> oThe sequence of labels should be consistent with network order.
>
> This proved impossible -- a domain name consisting of the labels
>
> in network order) L1.R2.R3.L4 will be displayed as L1.R3.R2.L4 in
>
> an LTR context.  (In an RTL context, it will be displayed as
>
> L4.R3.R2.L1)
>
>   
>
> And I have tried two implemented tools (well I don't know if they 
> follow the RFC fully or not).
>
> http://unicode.org/cldr/utility/idna.jsp?a=%D8%B1%D8%A7%D8%A6%D8%AF888.999.%D8%A7%D9%84%D8%B3%D8%B9%D9%88%D8%AF%D9%8A%D8%A9#notes
>
> http://mct.verisign-grs.com/conversiontool/convertServlet?input=%D8%B1%D8%A7%D8%A6%D8%AF888.999.%D8%A7%D9%84%D8%B3%D8%B9%D9%88%D8%AF%D9%8A%D8%A9&type=UTF8 
> <http://mct.verisign-grs.com/conversiontool/convertServlet?input=%D8%B1%D8%A7%D8%A6%D8%AF888.999.%D8%A7%D9%84%D8%B3%D8%B9%D9%88%D8%AF%D9%8A%D8%A9&type=UTF8>
>
> Abdulrahman,
>
>
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