Re: Before-Looks or After-Looks

Dennis,

Let me try to rephrase

I have a document D1 at t0

Modifications are made on D1 at a later time t1 ( t1 > t0 )

My understanding is if I REJECT ALL the modifications done on D1, I get
back to D1

Is this "1.a" scenario ?

If such, I don't get how 1.b could make sense unless we are in a ACCEPT ALL
scenario

Mohamed

On Tue, Sep 23, 2014 at 11:56 PM, Dennis E. Hamilton <
dennis.hamilton@acm.org> wrote:

> I think there is a fundamental difference to be considered.  It has to do
> with answering the following question:
>
> 1. When the change-tracking information is all ignored, what remains,
>         a. The original unchanged XML document (the before-look), or
>         b. The fully-changed XML document (the after-look)?
>
> There may be a requirement here.
>
> At one point, I thought that it didn’t matter, in the sense that one form
> could be transformed to the other (before removing the change-tracking).
> Now, I am not so sure.
>
> The ODF representation for tracked changes has (1.b) as its default result
> when change-tracking information is ignored.  In an interoperability
> setting, that seems to be the safest approach.
>
> There is one case where the before-look is needed and that is when the
> document file is digitally signed and can’t be modified without that
> counting as tampering.  So however change is represented, it can’t touch
> the original.  One could still provide an after-look style of tracked
> changes using a copy.  That’s messier.  Or one could use some sort of
> supplemental information that accounts for changes to the original without
> touching the original, a case that I touched on in my DChanges paper on
> Protected Change-Tracking.  This can be made a specialized problem, with
> general change-tracking still handled with case (1.b).
>
> How does the choice between before-looks and after-looks come down in the
> usage scenarios others are considering?
>
>
>  -- Dennis E. Hamilton
>     dennis.hamilton@acm.org    +1-206-779-9430
>     https://keybase.io/orcmid  PGP F96E 89FF D456 628A
>     X.509 certs used and requested for signed e-mail
>
>
>
>


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