Sure. Here they are:

population (P1082): number of people inhabiting the place
point in time (P585): time and date something took place, existed or a statement was true
determination method (P459): qualifier stating how a value has been determined
applies to part (P518): part of the item for which the claim is valid

Use Property search to search for properties

Help:Sources has info on references and properties to use with them.

On Tue, Jun 10, 2014 at 5:18 PM, Edward Summers <ehs@pobox.com> wrote:

This is good news, and helps a lot — thanks for taking the time to respond Joe. It may be a lot of work, but it would be great if you could reference the actual property names by URL for the properties you mentioned.

//Ed

On Jun 9, 2014, at 6:10 AM, Joe Filceolaire <filceolaire@gmail.com> wrote:

> Edward
>
> Yes Wikidata has a mechanism for adding qualifiers and references to claims.
>
> Where there are multiple values we can also mark one of them as preferred and then simple queries will just get the preferred value.
>
> For population figures each value would typically have qualifiers for
> * Point in time (when the population figure applies)
> * Determination method (census, estimate, whatever)
> * Applies to part (total, black, white, christian, muslim etc.)
> And each value would have a reference with the organisation, the url, the date the info was published, the date the info was retrieved etc.
>
> The most current total value would be marked as 'preferred'. Values which are widely known but considered unreliable would be included but marked 'deprecated'.
>
> All these properties have already been implemented and we are starting to add them to items.
>
> Hope this helps
>
> Joe
>
>
> On Mon, Jun 9, 2014 at 9:31 AM, rupert THURNER <rupert.thurner@gmail.com> wrote:
> hi alex,
>
> i saw on https://www.wikidata.org/wiki/Wikidata:Property_proposal/Economics
> a hint to provide sample data. would it be not an option to provide a
> couple of data points to make the life of persons easier, instead of
> making them open links and tables?
>
> rupert
>
>
> On Mon, Jun 9, 2014 at 3:55 AM, Alex Peek <alexpeek1@gmail.com> wrote:
> > We are a new project looking for volunteers.
> >
> > Project homepage: https://meta.wikimedia.org/wiki/The_Global_Economic_Map
> >
> > Thanks,
> >
> > Alex
> >
> > _______________________________________________
> > Wikidata-l mailing list
> > Wikidata-l@lists.wikimedia.org
> > https://lists.wikimedia.org/mailman/listinfo/wikidata-l
> >
>
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