On Mon, Nov 5, 2012 at 6:18 PM, Martin Koppenhoefer <dieterdre...@gmail.com>wrote:
> 2012/11/5 David Groom <revi...@pacific-rim.net>: > > btw.: also removing might be of interest, e.g. someone checking "all" > businesses in OSM and removing them in the case they are closed now > would be a major improvement we would like to have fed back into OSM > also if nothing was actually _added_. Such elimination would be impossible without using an external data source of businesses now open/closed, so in my view this would constitute a Derivative Database (with physical observations). "Adding" is an abstract term: "removing" closed businesses could be viewed as adding information about whether a business is now open or closed. Even if you then physically remove all closed businesses from the database, this information would still remain (implicitly) in the database. Igor
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