RDFXMLParser emit ASCII N-Triples

[Andreas Harth]

Hi,

there's a bug in LDSpider: the emitted N-Quads data is not in ASCII
format, but rather Unicode - NQuads is supposed to have ASCII encoding
though.

Is there a way to tell the RDFXMLParser to emit escaped for Nx Nodes?

The same issue may appear in conjunction with Any23, but haven't tested
that.

Cheers,
Andreas.

[Tobias Käfer]

Hi,

I can find plenty of \uxxxx character sequences in the files it emits for me, so what mal-encoded character sequences have you come across?

Cheers,

Tobias

[Andreas Harth]

Hi Tobias,

On 28/05/13 09:52, Tobias Käfer wrote:
> I can find plenty of \uxxxx character sequences in the files it emits
> for me, so what mal-encoded character sequences have you come
> across?

ah, you're right there, literals are ok.

But there are problems with IRIs.

For example, I get the following triple for [1]:

<http://dbpedia.org/resource/Garden_Grove,_California>
<http://www.w3.org/2002/07/owl#sameAs> <http://ko.dbpedia.org/resource
/가든그로브> .

On systems with Unicode support that works (although I have to do a bit
of sed wizardry to get rapper to parse the N-Quads files). But on
systems which do not have Unicode as default encoding, I get a lot of
????'s in IRIs, which messes up the dataset big time.

There are presumable issues with BNode as well, as BNodes get
constructed from IRIs. But I haven't tested that, DBpedia is the
only dataset with IRIs I've come across, and they are skimpy with
blank nodes.

Cheers,
Andreas.

[1] http://dbpedia.org/resource/Garden_Grove,_California

[Tobias Käfer]

Hi Andreas,

seems like you are using an outdated version of NxParser for your crawling. In r110 (Aug 28, 2012) of the source of NxParser, this has been fixed.

Btw.: We discussed the way of encoding here [1] and decided for rapper-compatibility, so we take the URIs as they are and encode them according to the unicode-related rules of N-Triples, instead of percent-encoding.

Cheers,

Tobias

[1] http://answers.semanticweb.com/questions/18508/best-way-to-encode-uri-refsiris-for-n-triples