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<p>Hi Antonin,<br>
</p>
<div class="moz-cite-prefix">On 05.02.19 16:02, Antonin Delpeuch
(lists) wrote:<br>
</div>
<blockquote type="cite"
cite="mid:cb9a18de-6232-bbf7-35e3-622a2f1bf35f@antonin.delpeuch.eu">
<pre class="moz-quote-pre" wrap="">Hi Sebastian,
Great, thanks! Beyond the description of the ontology, it would be quite
useful to have a more explanatory description of NIF as a file format
for NERD datasets. The ontology only loosely describes the format: for
instance, it is not clear to me which statements are required, which
ones are optional, which ones can have multiple values, and so on.</pre>
</blockquote>
<p>you need to cut me some slack here. We really tried to do that
back then with the validation model in OWL. However, OWL was not
well-suited, so my PhD student Dimitris Kontokostas made the W3C
standard SHACL to directly address this issue:</p>
<p>* <strong> <span><span><a
href="http://jens-lehmann.org/files/2014/eswc_rdfunit_nlp.pdf">NLP
data cleansing based on Linguistic Ontology constraints</a></span></span>
<span> <span class="meta"><em>by</em> <span class="author"><span>Dimitris
Kontokostas</span>, <span>Martin Brümmer</span>, <span>Sebastian
Hellmann</span>, <span>Jens Lehmann</span>, and <span>Lazaros
Ioannidis</span></span></span> </span> </strong> <span
class="meta"> <span><span><em>in</em> Proc. of the Extended
Semantic Web Conference 2014</span></span></span></p>
<p>* <a class="moz-txt-link-freetext" href="https://www.w3.org/TR/shacl/">https://www.w3.org/TR/shacl/</a><br>
</p>
<blockquote type="cite"
cite="mid:cb9a18de-6232-bbf7-35e3-622a2f1bf35f@antonin.delpeuch.eu">
<pre class="moz-quote-pre" wrap="">
Moreover, the NIF format also uses predicates from other namespaces
which are not described there, so that makes it even harder to
understand, I think.
</pre>
</blockquote>
<p>This is also a common problem, which can be addressed by SHACL as
well. <br>
</p>
<p>If I were to do NIF again, I would only use SHACL and RDFS and
not OWL at all. SHACL is a much better modelling language and you
can scope over external classes. <br>
</p>
<blockquote type="cite"
cite="mid:cb9a18de-6232-bbf7-35e3-622a2f1bf35f@antonin.delpeuch.eu">
<pre class="moz-quote-pre" wrap="">
Having such a document (with examples) would really encourage people
from outside the semantic web community (such as NLP researchers not
familiar with these terminologies) to embrace the format, I think.</pre>
</blockquote>
<p>RDFUnit (<a class="moz-txt-link-freetext" href="https://github.com/AKSW/RDFUnit">https://github.com/AKSW/RDFUnit</a>) can be hosted as a
webservices with SHACL, so you will get a free validator, see e.g.
here:</p>
<p><a class="moz-txt-link-freetext" href="http://databus.dbpedia.org:8080/shacl/validate?d=http://kurzum.net/webid.ttl&A&s=https://raw.githubusercontent.com/dbpedia/webid/master/voc/webid-shacl.ttl">http://databus.dbpedia.org:8080/shacl/validate?d=http://kurzum.net/webid.ttl&A&s=https://raw.githubusercontent.com/dbpedia/webid/master/voc/webid-shacl.ttl</a></p>
<p>If you have the time, I think it would be good to rewrite NIF in
SHACL and then publish all versions on the Databus. Things will
get much easier for everybody.</p>
<p><br>
</p>
<p>All the best,</p>
<p>Sebastian<br>
</p>
<p><br>
</p>
<p><br>
</p>
<p><br>
</p>
<blockquote type="cite"
cite="mid:cb9a18de-6232-bbf7-35e3-622a2f1bf35f@antonin.delpeuch.eu">
<pre class="moz-quote-pre" wrap="">
Best,
Antonin
On 2/5/19 2:44 PM, <a class="moz-txt-link-abbreviated" href="mailto:hellmann@informatik.uni-leipzig.de">hellmann@informatik.uni-leipzig.de</a> wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Hi Antonin,
The turtle file is here
<a class="moz-txt-link-freetext" href="http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core/nif-core.ttl">http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core/nif-core.ttl</a>
There is a broken internal redirect pending to be fixed.
2.1 is here <a class="moz-txt-link-freetext" href="https://github.com/NLP2RDF/ontologies">https://github.com/NLP2RDF/ontologies</a>
Over the years it became clear that publishing ontologies like this is
very unpractical. We are working on <a class="moz-txt-link-freetext" href="https://databus.dbpedia.org">https://databus.dbpedia.org</a> .
When it is ready, I will migrate the ontology there. It like maven
central for data, so you can build your app on the right version...
Sebastian
On February 5, 2019 2:32:29 PM GMT+01:00, "Antonin Delpeuch (lists)"
<a class="moz-txt-link-rfc2396E" href="mailto:lists@antonin.delpeuch.eu"><lists@antonin.delpeuch.eu></a> wrote:
Hi,
I was looking for the definition of the NIF format. It seems that it
used to be available at:
<a class="moz-txt-link-freetext" href="http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#">http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#</a>
This link currently gives an HTTP 403 error for me. I found it in the
"Integrating NLP using Linked Data paper":
<a class="moz-txt-link-freetext" href="http://svn.aksw.org/papers/2013/ISWC_NIF/public.pdf">http://svn.aksw.org/papers/2013/ISWC_NIF/public.pdf</a>
Given that this link appears in a published paper, I think it is very
important that there is an effort to maintain it (otherwise the
"persistence" in the domain name is not really deserved).
The same link is also used at:
<a class="moz-txt-link-freetext" href="http://persistence.uni-leipzig.org/nlp2rdf/">http://persistence.uni-leipzig.org/nlp2rdf/</a>
Thanks to Wikidata (<a class="moz-txt-link-freetext" href="https://www.wikidata.org/wiki/Q31794099">https://www.wikidata.org/wiki/Q31794099</a>) I was able
to find
<a class="moz-txt-link-freetext" href="http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core/nif-core.html">http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core/nif-core.html</a>,
which seems to be about NIF 2.0, what about NIF 2.1?
Best regards,
Antonin Delpeuch
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</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
</pre>
</blockquote>
<div class="moz-signature">-- <br>
All the best,<br>
Sebastian Hellmann<br>
<br>
<small> Director of Knowledge Integration and Linked Data
Technologies (KILT) Competence Center<br>
at the Institute for Applied Informatics (InfAI) at Leipzig
University<br>
Executive Director of the DBpedia Association<br>
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