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Subject: Re: [office] Inversed MCT
On Fri, 2012-07-20 at 18:31 -0600, André Rebentisch wrote: > Am 20.07.2012 15:11, schrieb Patrick Durusau: > > André, > ... > > To the best of my knowledge, intervening "untracked" changes have the > > same result for all methods of change tracking. > > > > When there is a gap in the tracking of changes you have unpredictable > > results. > > With change tracking info ignored by the consuming implementation, does > the resulting saved XML document core reflect the state before (A) or > after (B) changes were carried out? Obviously the former would result in > difficulties when change tracking is not implemented by the consuming > implementation. Thus you have to save state B and inversed change > tracking (undo, "ODF history"). > > Under MCT we have Svante's original concept with a notion of "inverse > operations", undo.xml and .undo directory storage. The premise is that > for each "add" operation you have an equivalent "remove" operation: > "Every operation has an inverse operation" > > In a realtime multi-user collaboration environment (from which MCT too > inspiration) you would rather want to follow a merge logic, based on a > shared source document ("A") and sharing operations, and the analysis of > the select committee largely followed a merge perspective in their > examples (assumption that inversion was a simple technicality). > > How do the different approaches satisfy inversibility needs? During the last year it was repeatedly stated that an ODF document with change tracking information when read by a consumer that does not understand the change tracking markup should appear as if all changes had been accepted (your case B above). This seems to imply that the document itself must always contain the final product. Since all user actions are obviously reversible provided sufficient information is kept I don't see how there is any huge difference between recording an action or its inverse. Andreas -- Andreas J. Guelzow, PhD, FTICA Concordia University College of Alberta
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