I would disagree.
The DBpedia Ontology is not designed to support any specific kind of
reasoning.
What it *is* designed to do is capture the somewhat structured data that
exists in Wikipedia. Following the much misunderstood "semantic web",
the emphasis is on properties first, and then classes second. Think of
it as a set of baseball or Pokemon cards; the point is not to replicate
or even closely describe the performance or rules of the game, but to
go after the long hanging fruit of "things that are easy to ontologize."
There is a real price to pay for this; from the viewpoint of
conventional application development and introductory computer science,
the data is not always factually correct or satisfies the invariants
required for a particular algorithm. Practically that means that you
might ask for "US States" and get 48 or 51, that somebody like Barry
Bonds or Mel Gibson has their career much better represented than J.
Edgar Hoover or J. Eric S. Thompson, and you would probably find that
the "tree of life" in DBpedia is not really a tree.
If you need to reasoning in some domain you need to find some area you
are willing to pump the entropy out of, create the data structures
appropriate for what you want to do, and possibly incorporate data from
DBpedia, doing whatever cleanup is necessary. That's not different at
all from the situation of "doing reasoning over reasoning over data
collected by a large organization".
------ Original Message ------
From: "John Flynn" <jflyn...@verizon.net>
To: "'Sebastian Hellmann'" <hellm...@informatik.uni-leipzig.de>;
"'semantic-web at W3C'" <semantic-...@w3c.org>; "'public-lod'"
<public-...@w3.org>; "'DBpedia'"
<Dbpedia-discussion@lists.sourceforge.net>
Sent: 7/5/2017 11:43:02 AM
Subject: Re: [DBpedia-discussion] Call for Ontology Editor demos for
DBpedia
I have long been curious about the DBpedia ontology structure so I just
took a look at the ontology represented in
(https://dl.dropboxusercontent.com/u/375401/dbo_no_mappings.nt) as
referenced in the email below.
I normally start the evaluation of an ontology by looking at the
top-down class relationships. So, I did a search for the classes that
were listed as a direct subclass of owl#Thing to get a general idea of
the organization of the DBpedia class structure.
To say the least, I was sorely disappointed. Here are a few of the
DBpedia classes that are direct subclasses of owl#Thing: Food, Media,
Work, Blazon, Altitude, Language, Currency, Statistic, Diploma, Award,
Agent, PublicService, Disease, GrossDomesticProdutPerCapita,
ElectionDiagram, Demographics, Relationship, Medicine, List,
BioMolecule. I gave up after this small sample. It is obvious that the
DBpedia community needs to worry a lot more about the structure of the
ontology itself rather than focusing on selecting a new editor. A
working group needs to be established to go back to the drawing board
and look at the DBpedia ontology form the top down. It certainly
doesn't make much sense as it is currently structured.
John Flynn
http://semanticsimulations.com
From: Sebastian Hellmann [mailto:hellm...@informatik.uni-leipzig.de]
Sent: Wednesday, July 05, 2017 10:43 AM
To: 'semantic-web at W3C'; public-lod; DBpedia
Subject: [DBpedia-discussion] Call for Ontology Editor demos for
DBpedia
Dear all,
we are preparing a switch from the mappings wiki
(http://mappings.dbpedia.org) to another ontology editor and started to
collect requirements/tools here:
https://docs.google.com/document/d/1HwtJJ3jIlrQAPwHYhvpw4a4Z4hZorTGaZTB8Bq8Y-TI/edit
We already have a demo for Webprotege thanks to Ismael Rodriguez, our
GSoC student. As we are lacking time and resources, we will probably
only consider editors with a running demo, so the community can try it.
Our main interest is of course to manage the DBpedia core ontology and
push any mappings to other ontologies in separate files. So we provide
a core version for demo purposes created with:
rapper -g dbpedia_2016-10.nt | grep -v
'\(http://schema.org\|http://www.wikidata.org\|http://www.ontologydesignpatterns.org\
<http://schema.org/|http:/www.wikidata.org/|http:/www.ontologydesignpatterns.org/>)'
> dbo_no_mappings.nt
https://dl.dropboxusercontent.com/u/375401/dbo_no_mappings.nt
(I hope that the regex didn't kick out anything essential or broke any
axioms...)
We would be very happy, if anyone from the semantic web community would
make a demo with their favorite editor and add a link to the Google Doc
and post a short message on the DBpedia discussion list[1] or on slack
https://dbpedia.slack.com/ .
This would help us to make a more informed decision. The next DBpedia
Dev online meeting will be on 2nd of August 14:00 (each first Wednesday
per month). Presentations of editors are also welcome. We will also
discuss the editor question during the DBpedia meeting in Amsterdam,
co-located with SEMANTiCS on 14.9.
http://wiki.dbpedia.org/meetings/Amsterdam2017
Thank you for your help!
[1] https://sourceforge.net/projects/dbpedia/lists/dbpedia-discussion
--
All the best,
Sebastian Hellmann
Director of Knowledge Integration and Linked Data Technologies (KILT)
Competence Center
at the Institute for Applied Informatics (InfAI) at Leipzig University
Executive Director of the DBpedia Association
Projects: http://dbpedia.org, http://nlp2rdf.org,
http://linguistics.okfn.org, https://www.w3.org/community/ld4lt
<http://www.w3.org/community/ld4lt>
Homepage: http://aksw.org/SebastianHellmann
Research Group: http://aksw.org
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