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Re: Quality Criteria for Linked Data sources

From: Olaf Hartig <hartig@informatik.hu-berlin.de>
Date: Thu, 16 Dec 2010 11:17:57 +0100
To: public-lod@w3.org
Message-Id: <201012161118.00310.hartig@informatik.hu-berlin.de>
Hey Bob,

In this work we focus on Linked Data sources only. Our aim is to understand 
what quality criteria can be used for this type of data source (or information 
service as you call it) and what do criteria defined in other, similar contexts 
mean in the context of Linked Data sources.

Said that, you are right, certain criteria for a Linked Data source depend on 
the original data source that is wrapped by a Linked Data source. This may not 
only include criteria from the "Content" category but also from "System" and 
"Usage". Nonetheless, even for "Content" criteria several quality issues might 
have been introduced by the Linked Data source and cannot be attributed to
the original source. These kind of Linked Data specific issues is what we are 


On Thursday 16 December 2010 10:12:56 Bob Ferris wrote:
> Hi Annika,
> "Our aim was to decide on a set of criteria that represent the quality
> of a data source. In this document, we understand a data source as an
> access point for Linked Data in the Web."
> Does this mean that you consider only information services that follow
> the Linked Data principles? So would you exclude existing information
> services e.g., Wikipedia, MusicBrainz, Last.fm, Discogs, Echo Nest?
> I think it is crucial to have information service quality ratings
> especially for this kind of information services, because they are
> currently the backbone of the existing Linked Data services that do
> Linked Data information providing and information integration tasks.
> Cheers,
> Bob
> Am 15.12.2010 20:49, schrieb Annika Flemming:
> > Hi,
> > I'm a student at the Humboldt University of Berlin and I'm currently
> > writing my diploma thesis under the supervision of Olaf Hartig. The aim
> > of my thesis is to draw up a set of criteria to assess the quality of
> > Linked Data sources. My findings include eleven criteria grouped into
> > four categories. Each criterion includes a set of so-called indicators.
> > These indicators constitute a measurable aspect of a criterion and,
> > thus, allow for the assessment of the quality of a data source w.r.t the
> > criteria. I've written a summary of my findings, which can be accessed
> > here:
> > 
> > http://sourceforge.net/apps/mediawiki/trdf/index.php?title=Quality_Criter
> > ia_for_Linked_Data_sources
> > 
> > To evaluate my findings, I decided to post this summary hoping to receive
> > some feedback about the criteria and indicators I suggested. Moreover,
> > I'd like to initiate a discussion about my findings, and about their
> > applicability to a quality assessment of data sources.
> > 
> > Your comments might be included in my thesis, but I won't add any names.
> OT: I think in a community it is quite natural to honour the people
> somehow, when they contributed useful (!) feedback. You might consider
> this ;)
> > A further summary will follow shortly, describing a formalism based on
> > these criteria and its application to several data sources.
> > 
> > Thanks to everyone participating,
> > Annika
Received on Thursday, 16 December 2010 10:18:39 UTC

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