Well, I don't know if they would hurt anyone, but I don't think people would go
through the extra effort to set them. Here are our current properties.
http://www.wikidata.org/wiki/Wikidata:List_of_properties We could categorize
them according to mutability, but we'd also need to know how many times each
property is used. For historic population values, qualifiers will serve the
purpose you want. For presidential terms, I think we will either see "started
presidency" and "ended presidency" properties that are added to items for
people who have been president, or we will see "administration began" and
"administration ended" properties added to items for each presidential
term/administration.
Date: Fri, 5 Apr 2013 00:49:04 +0200
From: bene...@zedat.fu-berlin.de
To: wikidata-l@lists.wikimedia.org
Subject: Re: [Wikidata-l] Page history and properties
Good Point! The first things I thougt
about were populations and other country, region or city oriented
data.
But would two fields that can be set to NULL as default -
valid_from -> the beginning of the time, valid_to -> the end
of the universe - hurt anyone?
Am Fr 05.04.2013 00:37, schrieb Michael Hale:
I don't have any data to agree or disagree with you
about that, but most of the edits I have made have been for
films. Most of those claims are immutable.
Date: Fri, 5 Apr 2013 00:34:21 +0200
From: bene...@zedat.fu-berlin.de
To: wikidata-l@lists.wikimedia.org
Subject: Re: [Wikidata-l] Page history and properties
I don't think, that the most
claims are immutable.
Am Fr 05.04.2013 00:30, schrieb Michael Hale:
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.
>
>
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