We will use qualifiers to tag values with dates for which they are relevant if there isn't a better place to put the information. We commonly use the example of historic population values. MediaWiki software saves disk space by delta encoding edit histories. http://en.wikipedia.org/wiki/Delta_encoding I can probably think of at least 5 different ways we could arrange the schema of Wikidata to store information about US presidents, but I don't think using universal valid_from and valid_to values for every claim is the most efficient, natural, or flexible way to do so.
> Date: Fri, 5 Apr 2013 00:08:00 +0200 > From: bene...@zedat.fu-berlin.de > To: wikidata-l@lists.wikimedia.org > Subject: Re: [Wikidata-l] Page history and properties > > And what are you doing when you want the knowledge of the world from 5 > years ago? Isn't this a valid need? To compare what have changed for > example in the measurement of ocean depth? > > These snapshots could be a low hanging fruit with valid_from and > valid_to and it is saving disk space compared to storing complete dumps > every day. > > > Instead of having a "List of Presidents of the US" or looking up every > person for a property "President of the USA" you could get this List > from the property "President" from the Item "USA" together with > valid_from and valid_to. > > Lukas > > Am Do 04.04.2013 22:23, schrieb Michael Hale: > > I thought one of the main reasons we are making Wikidata is so that > > you can update a value there, and then everywhere it is used will be > > automatically updated. If we find a more precise measurement for the > > depth of an ocean trench, then I just want to update it on Wikidata, > > and then every article that references it will be updated. I don't > > want to have to update it on Wikidata and then go do a null edit on > > every article that uses that information. > > > _______________________________________________ > Wikidata-l mailing list > Wikidata-l@lists.wikimedia.org > https://lists.wikimedia.org/mailman/listinfo/wikidata-l
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