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
[email protected]

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