[OSM-dev] Augmented Diffs

[Roland Olbricht]

> The docs you list are a bit confusing, so I went to the XML itself,
> and that has some issues, mainly name/document related.
> 
> 1. The "osm" tag name is already used for a format, so I suggest not using
> it.
> 
> Similarly "osmChange" or "osc" files are already maybe you should call
> this something else?

Thank you for pointing me at this. I think of
osmAugmented or
osmAugmentedChange
and subsequently a file name extension .osa.
 
> 2. The sections are a bit confusing in that the order is very
> important. That makes parsing a bit more difficult than it might need
> to be if you just renamed sections? Eg "keep" means two different
> things in two different contexts, but by using the same name, it means
> your parser must keep a lot of state.

What do you mean exactly? The purpose of the elements in keep is always the 
same: this is data that is unchanged but related to changed data.

Of course there are different reasons why an element arrives in keep. However, 
this will make things difficult: an element could be present for more than one 
reason, for example a node because it is referred by more than one element.

What do you think of the hierarchy
for nodes:
- coords changed
- tags changed
- part of a changed geometry
for ways:
- members changed
- geometry of members changed
- tags changed
and for relations the same, maybe with a separate set of events for nested 
relations, in the sense that a element is listed only once at the event of 
highest precedence.

Cheers,

Roland
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