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Re: DBpedia hosting burden

From: Andy Seaborne <andy.seaborne@talis.com>
Date: Thu, 15 Apr 2010 13:38:55 +0100
Message-ID: <4BC708DF.6070100@talis.com>
To: public-lod@w3.org
CC: dbpedia-discussion <dbpedia-discussion@lists.sourceforge.net>


On 15/04/2010 1:36 PM, Andy Seaborne wrote:
> I ran the files from
> http://www.openjena.org/~afs/DBPedia35-parse-log-2010-04-15.txt

Doh! Cut & paste error:

http://downloads.dbpedia.org/3.5/en/

> through
> an N-Triples parser with checking:
>
> The report is here (it's 25K lines long):
>
> http://www.openjena.org/~afs/DBPedia35-parse-log-2010-04-15.txt
>
> It covers both strict errors and warnings of ill-advised forms.
>
> A few examples:
>
> Bad IRI: <=?(''[[Nepenthes>
> Bad IRI: <http://www.european-athletics.org‎>
>
> Bad lexical forms for the value space:
> "1967-02-31"^^http://www.w3.org/2001/XMLSchema#date
> (there is no February the 31st)
>
>
> Warning of well known ports of other protocols:
> http://stream1.securenetsystems.net:443
>
> Warning about explicit about port 80:
>
> http://bibliotecadigitalhispanica.bne.es:80/
>
> and use of . and .. in absolute URIs which are all from the standard
> list of IRI warnings.
>
> Bad IRI: <http://dbpedia.org/resource/..> Code:
> 8/NON_INITIAL_DOT_SEGMENT in PATH: The path contains a segment /../ not
> at the beginning of a relative reference, or it contains a /./ These
> should be removed.
>
> Andy
>
> Software used:
>
> The IRI checker, by Jeremy Carroll, is available from
> http://www.openjena.org/iri/ and Maven.
>
> The lexical form checking is done by Apache Xerces.
>
> The N-triples parser is the one from TDB v0.8.5 which bundles the above
> two together.
>
>
> On 15/04/2010 9:54 AM, Malte Kiesel wrote:
>> Ivan Mikhailov wrote:
>>
>>> If I were The Emperor of LOD I'd ask all grand dukes of datasources to
>>> put fresh dumps at some torrent with control of UL/DL ratio :)
>>
>> Last time I checked (which was quite a while ago though), loading
>> DBpedia in a normal triple store such as Jena TDB didn't work very well
>> due to many issues with the DBpedia RDF (e.g., problems with the URIs of
>> external links scraped from Wikipedia).
>>
>> I don't know whether this is a bug in TDB or DBpedia but I guess this is
>> one of the problems causing people to use DBpedia online only - even if,
>> due to performance reasons, running it locally would be far better.
>>
>> Regards
>> Malte
>>
Received on Thursday, 15 April 2010 12:39:23 UTC

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