[OSM-dev] 0.6 Replication (was: Number of Edits)

[Andy Allan]

On Wed, Sep 24, 2008 at 12:30 PM, Brett Henderson <brett at bretth.com> wrote:

> Perhaps I completely misunderstood you.  I was worried that you might do
> something like this:
> 1. way 12345 is currently at version 1.
> 2. Via potlatch you edit way 12345 adding a new tag and create version 2.
> 3a. Via potlatch you immediately add a second tag and update version 2 to
> include the extra tag.
> 3b. Via potlatch you immediately add a second tag and create version 3
> including the extra tag.

3b. "In this situation a given changeset will increment the version
number of an object more than once."
http://wiki.openstreetmap.org/index.php/OSM_Protocol_Version_0.6#Version_numbers


> I'm happy with whatever label is applied, so long as I understand how it
> works :-)

Bah, the labelling is the easy bit and potentially the only bit that
I'll be any good at :-)


> It might make more sense to discuss the changesets implementation.  Here are
> several ways I could see them being implemented:
[...]
>
> I suspect we're using scheme 3.

>From my understanding, that's correct. Individual modifications become
ACIDy, but changesets are a loose grouping of changes for labelling,
comments and so on.

Cheers,
Andy