[ietf-dkim] Modified Introduction text for rfc4871-errata (resend)

[SM]

At 14:35 16-06-2009, Michael Thomas wrote:
>1) People saying that d= is THE IDENTIFIER are overloading the 
>value: d= a routing
>     label to a particular DNS subtree. Whether it has anything to do with THE
>     IDENTIFIER is purely coincidental. The assumption that these 
> two functions are
>     identical is bogus. i= was supposed to be this stable value 
> detached from the
>     mechanical DNS routing function.

That was the intent.  In 2007, during an informal discussion between 
some of the participants of this WG, someone asked about "d=" and 
"i=".  The general view was to take the domain name from the "i=".

d= was more of a way to identify the DNS subtree which the public key 
can be retrieved.  There was also a long discussion on the mailing 
list which lead to "q=".  One or more participants argued for a query 
infrastructure that was not DNS-based.

Regards,
-sm