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Kelson Vibber writes:
At 11:50 AM 1/21/2004, Meng Weng Wong wrote:
Well, the idea is that if a sender domain wants to define a new
mechanism, it can change the xmlns attribute to point to its DTD and
people out there can subscribe to it. Is that the idea?
Wait a second - If I'm reading this right, that means that SPF lookups, in
addition to adding 50-200% overhead to the DNS response, would also involve
HTTP requests as well?
I've had a hard enough time with DNS timeouts as it is. With XML namespace
support we'd have to deal with HTTP requests and their overhead. Not to
mention watching out for people deliberately publishing invalid or
arbitrarily large DTDs.
That's the case, alright; xmlns would require HTTP invocations for a
validating XML parser if I recall correctly. It's not a good plan IMO.
For future extensibility, the XML "win" can be incorporated into SPF, as
it stands, quite simply; just define the behaviour as "skip tokens that
are not understood". That's pretty much the core of XML's win as it
would apply to SPF records.
- --j.
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