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Re: `void :triples` redefined to be an estimate (#89)

From: Ruben Verborgh <ruben.verborgh@ugent.be>
Date: Tue, 6 Jan 2015 10:32:33 +0100
Cc: Andreas Kuckartz <a.kuckartz@ping.de>
Message-Id: <16E7CD53-04C2-435F-9A28-E0E4C56790C4@ugent.be>
To: Hydra <public-hydra@w3.org>
> According to http://www.hydra-cg.com/spec/latest/triple-pattern-fragments/ the object of the property void:triples is
> an integer literal expressing the estimated total number of matching triples"
> But http://www.w3.org/TR/void/ states:
> The total number of triples contained in the dataset
> And that document states for void:documents:
> This property is intended for datasets where the total number of triples or entities is hard to determine. void:triples or void:entities should be preferred where practical.
> That seems to substantiate that void:triples was intended for precise numbers, not estimates.

I got a verbal confirmation of Richard Cyganiak, co-author of VoID,
that “void:triples was never meant to be an exact number”.
But of course, if that's not what the spec says, we should be careful.

> I think it would be better to define and use a new property hydra:estimatedTiples or hydra:triplesEstimate. Maybe that property can be defined as a super-property of void:triples.

That might reduce its usefulness though.
If we proceed with another property, “triples” should not be part of its name.
(Perhaps hydra:estimatedItems, analogous to hydra:totalItems.)

Personally, I think an estimate is fine as value, but I'm open to other opinions.


Received on Tuesday, 6 January 2015 09:33:09 UTC

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