Esszett, Final Sigma, ZWJ and ZWNJ

[LB]

this is a matter of user. I would register "$£€. tld". Are we sure
that I will not have a problem, or these characters should not they be
protected, in case  "$" results  to "USD", "£" to "GBP", etc.

Thank you.
--
LB

2009/2/21 Vint Cerf <vint at google.com>:
> Folks,
>
> My reading of the consensus is that the WG has discussed and generally
> accepted that Esszett, Final Sigma, ZWJ and ZWNJ can be made PVALID.
> For registries that formerly mapped Esszett or Final Sigma, the
> solutions are:
>
> 1. block registration of Esszett and Final Sigma at the registry level
> (in which case any former registration forms are still valid but will
> not be found by entering the newly PVALID characters)
>
> 2. Bundle Esszett with "ss" and Final Sigma with lower case ("sigma")
> (and do so retrospectively for all prior registrations of the mapped
> forms).
>
> With regard to ZWJ and ZWNJ, these would be PVALID but constrained by
> CONTEXTJ rules as to their valid usage.
>
> As I read the charter, the WG has the latitude to adopt these
> recommendations.
>
> It has been pointed out that there are consequences of not mapping
> characters per IDNA2003. One example relates to the appearance of,
> e.g., Esszett in a URL. A side-effect of the mapping under IDNA2003 is
> that the Esszett character would be converted to "ss" and this would
> match a registration of a domain name that contained Esszett since the
> registered form would have been mapped prior to registration into the
> "ss" form. It seems beneficial to articulate to the best of our
> ability such side-effects as an aid to users, software writers,
> registries and registrars who may need to define policies for
> registration limitations or adopt other compensating practices.
>
> Vint
>
>
> Vint Cerf
> Google
> 1818 Library Street, Suite 400
> Reston, VA 20190
> 202-370-5637
> vint at google.com
>
>
>
>
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