Re: [dotNetRDF-bugs] Fwd: Unexpected SPARQL Query Results

[Rob V. <rv...@do...>]

Adam

It doesn't really matter which list you send it to we see it either way

This does appear to be a bug, filed as CORE-441 [1], more details as and
when I have them

Rob

[1] http://dotnetrdf.org/tracker/Issues/IssueDetail.aspx?&id=441

From:  Fedja Adam <ad...@ad...>
Reply-To:  dotNetRDF Bug Report tracking and resolution
<dot...@li...>
Date:  Tuesday, 10 March 2015 13:35
To:  <dot...@li...>
Subject:  [dotNetRDF-bugs] Fwd: Unexpected SPARQL Query Results

>     
>  Hallo dotNetRDF Team,
>  
>  I just realized I sent my previous E-Mail to the developer list instead of
> the bug tracker, so I've forwarded it to the bug report list. See below.
>  
> 
>  -------- Weitergeleitete Nachricht --------
>  Betreff:  [dotNetRDF-Develop] Unexpected SPARQL Query Results
>  Datum:  Mon, 09 Mar 2015 14:04:49 +0100
>  Von:  Fedja Adam <ad...@ad...> <mailto:ad...@ad...>
>  Antwort an:  dotNetRDF Developer Discussion and Feature Request
> <dot...@li...>
> <mailto:dot...@li...>
>  An:  dot...@li...
>  
>   Hello dotNetRDF Team,
>  
>  I am using the current dotNetRDF version from NuGet (1.0.7.3471) and am
> experiencing something that appears to be a bug in SPARQL Query evaluation.
> Consider the following RDF Database:
>  
>  [ Link ] <http://pastebin.com/2aYNdZ7j>
>  
>  It describes the relationship between sheep and wolves in the context of a
> fairytale. There are no other data sources, these are all existing triples, a
> total of seven.
>  
>  I am querying this tiny database using SparqlQueryParser, InMemoryDataset and
> LeviathanQueryProcessor. Now consider the following queries:
>  
>  [ Query A ] <http://pastebin.com/T73SVdBY>  retrieves the subject URIs of
> everything that is a Sheep. As expected with this dataset, the result is only
> Frame:Sheep itself, but it could be specific kinds of sheep in different
> datasets.
>  
>  [ Query B ] <http://pastebin.com/PMKmgUME>  retrieves the subject URIs of
> everything that a Wolf preys upon. Since a Wolf only has a PredatorOf
> relationship to Sheep, the expected result would still be only the Sheep URI.
> Instead, however, the resultset contains both Sheep and Wolf. In fact, the
> value of ?prey is, as expected, Sheep in both cases, but ?obj is Sheep in one
> of the results, and Wolf in the other.
>  
>  The first line of the WHERE condition clearly states that ?obj is required to
> be a ?prey, which is correct when both are Sheep (because a Sheep is a Sheep),
> but a Wolf is certainly not a Sheep. Both are animals, but that relationship
> goes the other way around.
>  
>  I have verified the above queries with the above database in Protege
> <http://protege.stanford.edu/>  and get the expected results, which leads me
> to the conclusion that this is in fact a bug in dotNetRDF.
>  
>  Can I expect a fixed NuGet package anytime soon? Is there a workaround?
>  
>  Regards,
>  Adam
>  
>  
>  
>  
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming The Go Parallel Website, sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub for all
> things parallel software development, from weekly thought leadership blogs to
> news, videos, case studies, tutorials and more. Take a look and join the
> conversation now.
> http://goparallel.sourceforge.net/____________________________________________
> ___ dotNetRDF-bugs mailing list dot...@li...
> https://lists.sourceforge.net/lists/listinfo/dotnetrdf-bugs
>