W3C home > Mailing lists > Public > public-lod@w3.org > April 2011

Re: 15 Ways to Think About Data Quality (Just for a Start)

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Tue, 12 Apr 2011 16:09:22 -0400
Message-ID: <4DA4B172.7050707@openlinksw.com>
To: glenn mcdonald <glenn@furia.com>
CC: "public-lod@w3.org" <public-lod@w3.org>
On 4/12/11 3:55 PM, glenn mcdonald wrote:
>
>     Please post the URL in question so I can double check what's
>     happening. Remember, I am sharing URLs across the Web, there are
>     many factor in play re. time variant nature of resources. etc..
>
>     Anyway, give me a URL and I can look into what might be happening.
>
>
> http://linkeddata.uriburner.com/ode/?uri=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael_Jackson
>
>     To you, I've wired the setting backwards i.e., I opted not to
>     impose the overhead of owl:sameAs union expansion by default.
>
>
> No, this is not a "to you" thing. The checkbox is off, but the sameAs 
> expansions *are* showing. I'm not arguing a philosophical point, I'm 
> observing that you have a UI bug.

The link above doesn't correspond to any link I've sent to you 
owl:sameAs inference context. Basically, that's ODE one of many browsers 
we offer. Its forte isn't showcasing owl:sameAs expansion.

Here are the links I sent earlier:


1. 
http://lod.openlinksw.com/describe/?uri=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael_Jackson 
-- basic description of 'Micheal Jackson' from DBpedia

2. 
http://lod.openlinksw.com/fct/rdfdesc/usage.vsp?g=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael_Jackson 
-- list of source named graphs in the host DBMS

3. 
http://lod.openlinksw.com/fct/rdfdesc/usage.vsp?g=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael_Jackson&tp=2 
-- list of named graphs with triples that reference this subject

4. 
http://lod.openlinksw.com/fct/rdfdesc/usage.vsp?g=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael_Jackson&tp=3 
-- explicit owl:sameAs relations across the entire DBMS (clicking on 
each Identifier will unveil the description graph for the Referent of 
said Identifier)

5. 
http://lod.openlinksw.com/fct/rdfdesc/usage.vsp?g=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael_Jackson&tp=4 
-- use of an InverseFunctionalProperty based rule to generate a fuzzy 
list of Identifiers that potentially share the same Referent (click on 
each link as per prior step)

6. 
http://lod.openlinksw.com/describe/?uri=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael_Jackson&sas=yes 
-- inference context enhanced description of 'Micheal Jackson' (this is 
a union expansion of all properties across all Identifiers in an 
owl:sameAs relation with DBpedia Entity, hence use of paging re. 
handling result set size.)

7. 
http://lod.openlinksw.com/describe/?url=http%3A%2F%2Fdbpedia.org%2Fresource%2FMichael_Jackson&sas=yes&p=6&lp=7&op=4&prev=&gp=6  
- Page 5 of 8 re. enhanced description of 'Micheal Jackson' .

I also sent the following links in response to your SPARQL solution to 
Danny's puzzle:


1. http://lod.openlinksw.com/c/CV5SCWN -- your SPARQL query
2. http://lod.openlinksw.com/c/CYOT3KC -- SPARQL 1.1 variant
3. http://lod.openlinksw.com/c/CYGCJVN - DESCRIBE (using this via raw 
/sparql endpoint will produce a graph in format of your choice).

Your queries:


**For the interested, the single-domain SPARQL query was this:

PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
PREFIX wn:<http://www.w3.org/2006/03/wn/wn20/schema/>
PREFIX id:<http://wordnet.rkbexplorer.com/id/>

SELECT DISTINCT ?planet WHERE {
   ?s1 wn:memberMeronymOf id:synset-solar_system-noun-1 .
   ?s1 rdfs:label ?planet .
   OPTIONAL {
     ?s1 wn:containsWordSense ?ws1 .
     ?ws1 wn:word ?w .
     ?ws2 wn:word ?w .
     ?s2 wn:containsWordSense ?ws2 .
     ?s2 wn:hyponymOf id:synset-Roman_deity-noun-1 .
   }
   FILTER (!bound(?s2))
}

and in SPARQL 1.1 it could be simplified to (I think):

PREFIX rdfs:<http://www.w3.org/2000/01/rdf-schema#>
PREFIX wn:<http://www.w3.org/2006/03/wn/wn20/schema/>
PREFIX id:<http://wordnet.rkbexplorer.com/id/>

SELECT DISTINCT ?planet WHERE {
   ?s1 wn:memberMeronymOf id:synset-solar_system-noun-1 .
   ?s1 rdfs:label ?planet .
   MINUS {
     ?s1 wn:containsWordSense ?ws1 .
     ?ws1 wn:word ?w .
     ?ws2 wn:word ?w .
     ?s2 wn:containsWordSense ?ws2 .
     ?s2 wn:hyponymOf id:synset-Roman_deity-noun-1 .
   }
}



>
>>     These are great. I support HTTP access, multiple formats, and
>>     URL-addressable queries/results/views.
>
>     But you have a "silo". The day you deliver Objects with IDs that
>     resolve to their Representations via URLs is the day I'll drop the
>     "silo" tag re. your data space :-)
>
>
> I wasn't even talking about Needle, but that day came long ago. All 
> Needle nodes have IDs that resolve to representations via URLs.

Okay, what where you talking about? Specificity helps everyone, this is 
a public forum etc..



-- 

Regards,

Kingsley Idehen	
President&  CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen
Received on Tuesday, 12 April 2011 20:09:46 UTC

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