Hi,
I'm still working on a change viewer based on OpenLayers using some sort
of augmented change files [1]. The format currently used is simply
extending the original osmChange with an 'augment' "action" at the end
of the file that contains all the old versions and referenced objects.
While the idea is to get the augmenting data from a local extract before
applying a regular diff, your augmented diffs might also be a good
source for this. I especially have a live edit viewer in mind, that
would not only show edited nodes but also ways and possibly relation
changes.
Therefore, it would be nice to also get the nodes of ways with no
geometry changes (tag changes only), to be able to show them on a map.
Consumers can still distinguish geometry from tag only changes by
comparing the old and new versions.
For relations, it might be a compromise to only include objects of
changed members (added, removed, role change). Created and deleted
relations would include all members. This probably would allow to
display changes, to update route length calculations and the like
without storing geometries and to update stored geometries, e.g. for
multipolygon validations. Not sure what to do about relation tag changes
though (the restaurant example).
Norbert
[1]
http://gis.19327.n5.nabble.com/Useful-post-bot-visualisation-tt5716898.html#a5717002
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