[OSM-talk] Potlatch, dual carriageways, and a broken changeset

[Russ Nelson]

Michal Migurski writes:
 > instead make sure that multi-level undo is completely bulletproof.

To make life more interesting, OSM editing goes on concurrently, and
yet nearly everyone who is editing is editing a chunk locally.  So OSM
is episodically being synched with chunks of data we call a
"changeset", but which also includes the concept of an "edit conflict"
meaning that two chunks have been edited at the same time.

Simultaneous editing of geodata is currently not a solved problem.
Even less solved is the concept of multi-level undo, much less
single-level undo.  Within an editing session?  Sure.  Within your
chunk of data?  Sure.  But not outside that.

PhD dissertations are waiting to be written.  Hard, hard, hard
problems here.  Thyre be dragans.  Many pitchers of beer to be awarded
at some future SOTM -- with at least one from me.

-- 
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