Wikidata is a wiki like any other, so you can just click "What links here"
on Property:P351 and pick up all items that way
On Fri, Jun 19, 2015 at 9:14 AM, Ricordisamoa <ricordisamoa(a)openmailbox.org>
wrote:
Just ask WDQ for a list of item ids, then pass them
to the live API
<https://www.wikidata.org/w/api.php?action=help&modules=wbgetentities>.
You may miss some recently edited items, but at least you wouldn't base
your edits upon outdated revisions (and wbeditentity
<https://www.wikidata.org/w/api.php?action=help&modules=wbeditentity>'s
"baserevid" argument completely eliminates the risk).
Il 19/06/2015 00:10, Andra Waagmeester ha scritto:
Indeed the ultimate truth source is on the wikidata site it self. However,
I am not aware of a way to query the Wikidata site for a list of items
fitting a certain condition (e.g. all Wikidata items containing a claim
with the NCBI Entrez Gene (P351) property.)
It is here that I need to rely on WDQ (and WDQS) and potentially risk
missing existing items due to delays in which WDQ (and WDAS) gets updated.
I would like to know if I could rely on a given time frame - being it
seconds, hours, days, or one week).
I currently assume a delay of a week, but I don't know how accurate this
assumption is.
Regards,
On Thu, Jun 18, 2015 at 10:23 PM, Stas Malyshev <smalyshev(a)wikimedia.org>
wrote:
Hi!
The way that updates work *in all systems*
(polling small lists of
recent changes at intervals and hoping that this leads to a complete
change history), it seems quite possible that such systems will
sometimes miss an update, at least in the long run and under varying
conditions (high server load, network troubles, update script down for a
while, whatever). Insufficient update frequency is maybe not the biggest
problem here (it should be in the range of one to a few minutes for all
of the services).
Very important point with which I agree - it is completely possible that
update polling misses an update, WDQS is no exception and it usually
does not treat it as a problem, as the next update can fill up the
missed one. However the ultimate truth source is on the wikidata site
only. Beware of the caches though - if you ask for the same data on the
same URL twice, I think you can get the same result even if the
underlying data changed in the meantime.
--
Stas Malyshev
smalyshev(a)wikimedia.org
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