W3C home > Mailing lists > Public > public-lod@w3.org > April 2010

Re: [semanticweb] ANN: DBpedia 3.5 released

From: Kingsley Idehen <kidehen@openlinksw.com>
Date: Fri, 16 Apr 2010 15:00:13 -0400
Message-ID: <4BC8B3BD.7010701@openlinksw.com>
To: baran@goldmail.de
CC: Ivan Mikhailov <imikhailov@openlinksw.com>, semanticweb@yahoogroups.com, public-lod@w3.org, SW-forum <semantic-web@w3.org>, dbpedia-discussion@lists.sourceforge.net, dbpedia-announcements@lists.sourceforge.net, Chris Bizer <chris@bizer.de>
baran@goldmail.de wrote:
> On Wed, 14 Apr 2010 19:48:53 +0300, Kingsley Idehen 
> <kidehen@openlinksw.com> wrote:
>
> > baran@goldmail.de wrote:
> >> > On Tue, 2010-04-13 at 21:58 +0300, baran@goldmail.de wrote:
> >>
> >> >> A fact of my experience since many years:
> >> >> The homepage of my grandma is better accessible than the flagship(!)
> >> >> of 'linked data' dbpedia.org...
> >> >>
> >> >> Someone who has used the endpoint dbpedia.org/sparql intensively
> >> >> knows what i mean:
> >> >>
> >> >> After one or two hours or so, it hangs, i try dbpedia.org with FFox,
> >> >> Opera, IE, >> it hangs also, after 5 minutes i try dbpedia.org,
> >> >> i see the page, for dbpedia.org/sparql i put my simple query again,
> >> >> it is ok.
> >> >>
> >> >> Since years it is the same story in the same rhythm.
> >>
> >> > On Wed, 14 Apr 2010 13:21:07 +0300,
> >> > Ivan Mikhailov <imikhailov@openlinksw.com> wrote:
> >> >
> >> > They say, the everlasting problem for professional cosmetics is
> >> growing
> >> > quality of optics and media used for movies, celebrities should
> >> continue
> >> > to look perfect. But I can bet you've never paid attention to that
> >> fact
> >> > while looking at the final result.
> >> >
> >> > Similarly, growing database size and growing hit rate and growing
> >> > complexity of queries are not obviously visible from outside, but 
> turn
> >> > the hosting into a race. We're improving the underlaying RDBMS as 
> fast
> >> > as we only can just to prevent the service from total halt. One might
> >> > wish to provide a better service on their own RDBMS and thus to 
> make a
> >> > good advertisement, but nobody else want to do that _and_ can do 
> that,
> >> > so we're alone under this load.
> >> >
> >> > If you wish, you may help us with hosting and/or equipment, or simply
> >> > set up a mirror site and we would be glad to redirect some part of
> >> load
> >> > to your cluster. Even an inexpensive $20000 mirror would help to some
> >> > degree.
> >>
> >> I understand you so:
> >>
> >> a.) There is enough know-how for running heavy SPARQL endpoints.
> >> b.) But there is no enough money.
> >>
> >> I cannot help in the way you think, because we work in different areas.
> >>
> >> I can access different SPARQL endpoints with different lists of 
> queries
> >> with a mouseclick under a single user-interface (surfing rdf-data with
> >> 'similar' ontology structure) and i can write comments to you or to
> >> fitting mailing-lists as i did it yesterday, that's all, sorry,
> >>
> >> thanks, baran.
> >>
> >> PS: Also thanks to Kingsley Idehen for interpreting 'HP of grandma' as
> >> a friendly metaphor.
> > Baran,
> > We solve problems.
> > What's your problem, be as clear as possible.

Baran,
>
> My first posting (see above on top) was for me clear, in 3-4 months i 
> promise to write here if there is 'for me' a sustainable enhancement 
> or not, it is very easy to fix it over time...
>
> Now I notice for example <http://dbpedia.org/property/abstract> must 
> suddenly be
>
> <http://dbpedia.org/ontology/abstract>, otherwise no response...

Ah!

Certainly a documentation issue re. changes.

This should certainly be communicated, absolutely!
>
> ok, why not, if it is for a better ontology structure, i adapt with my 
> client-side stuff and anticipate other unexpected changes. 
>
> But i have also other detailed questions for example about 
> literals-indexing (i'm not sure whether this is my problem) or simple 
> inferences like owl:TransitiveProperty (from Skos in dbpedia, or not?) 
> etc...
Interesting you bring this up as this is one of those SPARQL-Exts. 
issues, yes Virtuoso handles Transitivity, but you need to know how to 
enable its Inference Rules and Backward Chaining Reasoner. In this case, 
the DBpedia [1] or Virtuoso forums [2] will do.
>
> Is there an appropriate public(!) mailing-list for all who have 
> generally interest at similar things and (last not least) 'include the 
> DBpedia instance and SPARQL endpoint as being part of what constitutes 
> the DBpedia Team or DBpedia Project'?
Links:

1. https://lists.sourceforge.net/lists/listinfo/dbpedia-discussion -- 
DBpedia mailing list
2. 
http://sourceforge.net/mailarchive/forum.php?forum_name=virtuoso-users 
-- User List (most active and covers user and developer issues)
3. 
http://virtuoso.openlinksw.com/dataspace/dav/wiki/Main/VOSMailingLists 
-- General Mailing List Info Page
4. 
http://www.mail-archive.com/dbpedia-discussion@lists.sourceforge.net/msg01208.html 
-- old post about Transitivity and DBpedia
5. 
http://sourceforge.net/mailarchive/message.php?msg_name=4B72C32E.8050400%40openlinksw.com 
-- an old post using Relationship Ontology against DBpedia
6. http://bit.ly/cvAC9u -- Collection of examples that use DBpedia for a 
variety of queries that involves Transtivity etc.


>
> thanks, baran.
> --  
> Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ [2]

-- 

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 Friday, 16 April 2010 19:00:55 UTC

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