Re: Version vs. Namespace

[Graham <dtcd@xxxxxxx>]

On 12 Jul 2004, at 8:23 pm, Tim Bray wrote:

> Huh?  I thought I'd covered that in 
> http://imc.org/atom-syntax/mail-archive/msg06762.html -  I proposed a 
> default rule of MustIgnore if you see an element you don't recognize 
> in a feed whose version is higher than the version the software knows. 
>  Shouldn't that cover it?  I mean, an <atom:title> is still an 
> <atom:title> five years from now unless we foolishly change the 
> namespace, the assumption should be exactly that you can process the 
> markup you know from future versions unless it's explicitly marked 
> MustUnderstand.

If a version n atom:title has to be 100% compatible with a version m 
atom:title, what's the version attribute for? According to that last 
message, the only difference is enforcement of mustUnderstand in later 
versions - but shouldn't mustUnderstand be enforced in all versions? ie 
If the software doesn't understand any mustUnderstand element, even one 
from a version it is familiar with?

Graham

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