Yes, I think once qualifiers are enabled you would just have something 
like:...Property(head of local government)    ...    Value(Elizabeth I) - 
Qualifier("1558-1603") - Sources()    Value(James VI and I) - 
Qualifier("1603-1625") - Sources()    ......

There was a discussion about whether qualifiers should have specific datatypes 
other than just string, but I think we should only do that if needed.
From: [email protected]
Date: Thu, 14 Mar 2013 21:27:32 -0700
To: [email protected]
Subject: Re: [Wikidata-l] Expiration date for data

Thanks Denny for the update and everybody else for the feedback.
The cases I am particularly interested in are those of qualifiers to express 
that "Elizabeth I was Queen of England between 1558 and 1603", or that "the 
city of Vibo Valentia was in the Province of Catanzaro up to 1996, in the 
Province of Vibo Valentia until 2014 and in the Province of 
Catanzaro-Crotone-Vibo Valentia after 2014".
Until these qualifiers become available, the only way to represent that a 
region has changed its governor is to overwrite the old value of "head of local 
government" with the current one.
Dario
On Mar 14, 2013, at 3:57 AM, Denny Vrandečić <[email protected]> 
wrote:Hi Dario,
two or three features are still missing to enable that (sorted in order we are 
probably going to deploy them):* qualifiers* the time datatype
* statement ranks

As soon as they are available, this can be modeled in a way that it can be 
useful for projects accessing the data.
So, progress yet, but it's not there yet :)

Cheers,Denny





2013/3/14 Dario Taraborelli <[email protected]>

Has there been any progress on time-based qualifiers since this thread?

If so, can someone point me to relevant discussions/proposals?



Thanks

Dario



On Oct 11, 2012, at 8:28 AM, Marco Fleckinger <[email protected]> 
wrote:



> Hi,

>

> On 11.10.2012 16:12, Lydia Pintscher wrote:

>> On Thu, Oct 11, 2012 at 11:13 AM,<[email protected]>  wrote:

>>> Is there something like VALID_FROM and VALID_TO in your Database?

>>>

>>> LB

>>

>> This is basically what the qualifiers do.

>> http://meta.wikimedia.org/wiki/Wikidata/Notes/Data_model_primer has

>> more details.

>>

> Hm, sorry I didn't remember this. Thank you for reminding!

>

> Marco

>

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