Re: Last Call: draft-cheshire-dnsext-dns-sd (DNS-Based Service Discovery) to Informational RFC

[Chris Newman <Chris.Newman at Sun.COM>]

--On November 4, 2008 6:28:19 -0800 The IESG <iesg-secretary at ietf.org> 
wrote:
> The IESG has received a request from an individual submitter to consider
> the following document:
>
> - 'DNS-Based Service Discovery '
>    <draft-cheshire-dnsext-dns-sd-05.txt> as an Informational RFC

As a technical contributor and end user, I strongly support publication of 
this document, although I would prefer it was on the standards track.  I 
very much appreciate the text discussing why certain design decisions were 
made, as well as mentioning implementation/UI issues where people made 
mistakes in the past.

Other comments:

Section 4:

>   The <Instance> portion of the Service Instance Name is a single DNS
>   label, containing arbitrary precomposed (Unicode Normalization Form C
>   [UAX15]) UTF-8-encoded text [RFC 3629].

Have you considered referencing RFC 5198 instead?  It's based on the same 
normalization form, but has some minor restrictions/clarifications that are 
likely to improve interoperability.  As your current text allows line 
breaks (was that intentional?) it would be helpful to have a canonical form 
for line breaks that 5198 defines.  If you didn't intend to allow line 
breaks you might want to recommend against their use as well.

>   intended to ever be typed in by a user accessing a service; the user
>   accesses a service by selecting its name from a list of choices
>   presented on the screen.

Since this list may also be presented by a screen reader to the blind, and 
selection from the list is a mandatory part of the user experience, have 
you considered adding a way to include a language tag to assist screen 
readers in their translation to voice?  BCP 18 has some discussion of this. 
Is there implementation experience that a language tag is not necessary for 
this situation?

Section 19:

What is the title of the registry that will be listed on IANA's web page?

Do you believe it would be possible to merge the new service registry with 
this one:
 <http://www.iana.org/assignments/gssapi-service-names>
creating a single service-name registry shared by these protocols?

		Thanks,
		- Chris

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