Hoi,
If that is the use case, not much changes. We are talking software. When a property is selected, the software does not need to show the property number and still store it. Nothing new here. It does not need to change the label either when Wikidata decides to change the label. A report may be produced to show the use of the old label... Again, nothing new here. It has been done and can be done again.
Thanks,
      GerardM

On 9 July 2015 at 11:10, Daniel Kinzler <daniel.kinzler@wikimedia.de> wrote:
Am 09.07.2015 um 11:04 schrieb Gerard Meijssen:
> Hoi,
> My understanding is that it is machines that need to uniquely know what a
> property stands for. People are quite capable understanding what a combination
> of a P and a Q mean. At that time there is no disambiguation. With proper
> descriptions it is not hard at all to choose the right property when a new
> statement is made.

That is not the use case under discussion.

The use case is accessing data from wikitext on the client wiki, using something
like {{#property:date of birth}}. In order to do that, "date of birth" has to be
unique.

For picking a property on wikidata, when creating statements, unique labels are
not needed. That was never an issue, and never the subject of discussion.


--
Daniel Kinzler
Senior Software Developer

Wikimedia Deutschland
Gesellschaft zur Förderung Freien Wissens e.V.

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