On ma, 2008-03-03 at 10:32 -0800, ext Eric Rescorla wrote:
> I'm sure I'm wading into a swamp here, but:
>
> Say I have a resource identified by URI http://www.example.org/X.
>
> 1. Initially it has value A. I do a SUBSCRIBE and get value
> "A" and Etag 1
> 2. I do a subsequent get and get "B" with Etag 2.
> 3. I do a third get and get "A".
>
> Can the Etag in event 3 be 1?
What we currently say on the subject is this:
[An entity-tag is] guaranteed to be unique across all versions
of all entities for a resource and event package.
If the version of the entity, in this case "A", is identical to a
previous version, which is "A" in this case, then the entity-tag can
certainly be the same as well.
We would have the exact same result were we to generate the entity-tag
value using a hash function over the entity itself.
This is also unimportant for the subscriber, since it needs to store the
entity-tag "statelessly", and cannot defer any meaning from its value.
Cheers,
Aki
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