On 20/01/2020 14:19, Nicolas VIGNERON wrote:
> Le lun. 20 janv. 2020 à 14:14, Eugene Alvin Villar <seav80@gmail.com> a
> écrit :
>
>> On Mon, Jan 20, 2020, 9:06 PM Nicolas VIGNERON, <
>> vigneron.nicolas@gmail.com> wrote
>>
>>> In a nutshell, you can safely assume that only the property 'stated in'
>>> matters.
>>>
>>
>> I think 'inferred from' (P3452) should also be considered as an internal
>> reference.
>>
>
> Probably but this property is not often used.
>
> I managed to make a query work: https://w.wiki/FqH (number of use of the 76
> properties used in the references space for items located in Paris, the
> last part is to have a small sample and avoid timeout ; also, maybe the
> SPARQL code could be optimized, I just wanted to have an overview and
> confirm my assumption that only a few property are widely used)
>

Here's a version of the query with labels for the properties, making its
output a bit more readable:
     https://w.wiki/Fr9

Note that for external references, it's very common just to give the
identifier in the external database, via the appropriate property
(perhaps accompanied by a "retrieved" = <date>, but usually not.

   -- James.

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