Comments on draft-ietf-idnabis-bidi-04
Matitiahu Allouche
matial at il.ibm.com
Thu Aug 27 12:39:08 CEST 2009
This is an answer to Andrew Sullivan's comment on
draft-ietf-idnabis-bidi-04 which says:
<quote>
I find this peculiar:
A "Bidi domain name" is a domain name that contains at least one RTL
label.
If a domain name is RTL.RTL.RTL, it qualifies under this definition,
even though there is no bidirectionality (all labels have the same
directionality). Explaining why this is still "bidi" would leave me
less confused.
</quote>
I admit that this is a bit peculiar. However, if one considers the rules
for RTL labels (starting with R or AL character, but may contain digits),
it appears that there may be bidirectionality even within *one* RTL label.
Some words of explanation may be added to appease Andrew's concern. For
instance, complete the first sentence quoted by Andrew as follows:
A "Bidi domain name" is a domain name that contains at least one RTL
label. Since a RTL label may contain both R or AL letters which are read
from right to left, and digits which are read from left to right, even one
RTL label is potentially bidirectional.
Following is an answer to Andrew's comment which says:
<quote>
Rule 1 in §2 says, "The first character must be a character with BIDI
property L, R or AL." I can't tell whether that must is a requirement
or a statement of fact that is entailed by other IDNA rules.
</quote>
This is a requirement, and the word "must" would be better capitalized as
"MUST".
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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