my comments on draft-ietf-idnabis-bidi-05

Matitiahu Allouche matial at
Mon Sep 7 08:47:46 CEST 2009

On October first, Martin J. Dürst asked:
conditions 2/4: Why are BN (control characters) allowed in RTL but 
not in LTR?

BN characters are invisible and should be banned as allowing phishing and 
violating the Label Uniqueness requirement.  However, ZWJ and ZWNJ are 
classified as BN, and ZWNJ is required for the proper orthography of 
Persian which is written with the Arabic script, hence BNs are allowed in 
RTL labels.

Shalom (Regards),  Mati
           Bidi Architect
           Globalization Center Of Competency - Bidirectional Scripts
           IBM Israel
           Phone: +972 2 5888802    Fax: +972 2 5870333    Mobile: +972 52 

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