Re: My best practices for Ontology versioning for http://nlp2rdf.org, was Re: Versioning system for ontologies

Hi Sebastain,
I'm glad I could help you.
However, I still don't get why the workflow wouldn't work for ontologies
with "/". Are any of the
tools not appropriate?
Thanks for sharing the VAD link. I was not aware of the tool.
Best,
Daniel


2013/4/22 Sebastian Hellmann <hellmann@informatik.uni-leipzig.de>

>  Ah, yes, you are right. Thanks for your help.
> I was confused, because DBpedia also shows the instance data for the
> classes in the HTML interface (i.e. inbound triples):
> http://dbpedia.org/ontology/PopulatedPlace
>
> But of course, this is just a nice add-on for the HTML view. There is
> actually no "Get all instances of a class" via Linked Data, only via
> SPARQL.
>
> I have also updated
> https://github.com/NLP2RDF/persistence.uni-leipzig.org#-vs--uris with:
>
> There has been an ongoing debate about '#' vs. '/' . We focus on
> ontologies with '\#' here with URIs like:
> http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#String
> Note that ontologies with '/' URIs need to published differently
> (description not included here).
>
>
> By the way, DBpedia only uses something that looks like Pubby, i.e. the
> DBpedia VAD, which is written in vsp[1].
>
> Thanks again,
> Sebastian
>
> [1]https://github.com/dbpedia/dbpedia-vad-i18n
>
>
> Am 22.04.2013 12:17, schrieb Daniel Garijo:
>
> Hi, I'm not sure I see the issue here.
>
>
> 2013/4/22 Sebastian Hellmann <hellmann@informatik.uni-leipzig.de>
>
>>  Hm, no actually, this issue is quite easy, when it comes to large
>> databases.
>>
>> curl -H "Accept: text/turtle"
>> "http://dbpedia.org/ontology#PopulatedPlace"<http://dbpedia.org/ontology#PopulatedPlace>
>> is pretty much the same as:
>> curl -H "Accept: text/turtle" "http://dbpedia.org/ontology"<http://dbpedia.org/ontology>
>>
> But here you are not asking for any instance. You are asking for a document
>  where the ontology is defined.
>
>>
>> So my questions are:
>>
>> 1. What do you think is the expected output of
>> http://dbpedia.org/ontology ? 300 million triples as turtle?
>>
> No. You would see the description of the ontology. In DB-pedia they
> haven't done such redirection because
>  they are exposing both terms and classes with Pubby. But note that when
> you look for a term, no instances
> are returned.
>
>   2. How do you query all instances of type db-ont:PopulatedPlace via
>> Linked Data ?
>>
> Via a SPARQL query:
>  select ?instance where{
>  ?instance a db-ont:PopulatedPlace.
>  }
>  If you don't want all the instances, then add a "LIMIT". That is why
> they have a public endpoint, right?
>
>  Another example. The recent PROV-O Ontology (with namespace URI
> http://www.w3.org/ns/prov#).
>  If I have an endpoint with many prov:Entities published and I want them,
> I can perform a query
> as the one I did above. If I want to see the documentation of the term,
> then I would ask for
> http://www.w3.org/ns/prov#Entity and I would be redirected to it.
>  Doing an accept request for turtle to an ontology term would return the
> owl file of the ontology,
> not the instances of that term.
>
>  Best,
> Daniel
>
>>
>> q.e.d from my point of view, as you wouldn't get around these practical
>> problems.
>>
>> -- Sebastian
>>
>> Am 22.04.2013 11:50, schrieb Daniel Garijo:
>>
>>  Dear Sebastian,
>>  This statement:
>> "When you publish ontologies without data, you can use '#' . However, if
>> you want to query instances via Linked Data in a database, you have to use
>> '/' as DBpedia does for classes:
>> http://dbpedia.org/ontology/PopulatedPlace"
>>
>> is not correct. You can use "#" to query instances via Linked Data
>> databases. That is just the URI of the type. In fact if DBpedia had chosen
>>
>> "http://dbpedia.org/ontology#PopulatedPlace<http://dbpedia.org/ontology/PopulatedPlace>"
>> instead of its current URI it would still be fine. It doesn't affect the
>> query.
>>
>> I'm not going to enter in the debate of "# vs /", but normally it is a
>> design decission that has to do more with the size of vocabularies than the
>> instances.
>>
>> Best,
>> Daniel
>>
>>
>> 2013/4/22 Sebastian Hellmann <hellmann@informatik.uni-leipzig.de>
>>
>>>  Dear all,
>>>
>>> personally, I have been working on this for quite a while and for me the
>>> best and easiest way is as documented here:
>>> https://github.com/NLP2RDF/persistence.uni-leipzig.org#readme
>>>
>>> They are simple and effective and I couldn't imagine anything more.
>>>
>>> Note that I have also secured persistent hosting for the URIs (also an
>>> important point).
>>> Feedback welcome, of course.
>>>
>>> All the best,
>>> Sebastian
>>> Ontology:
>>> http://persistence.uni-leipzig.org/nlp2rdf/ontologies/nif-core#
>>>  # vs /
>>>
>>> When you publish ontologies without data, you can use '#' . However, if
>>> you want to query instances via Linked Data in a database, you have to use
>>> '/' as DBpedia does for classes:
>>> http://dbpedia.org/ontology/PopulatedPlace
>>>  <https://github.com/NLP2RDF/persistence.uni-leipzig.org#workflow>
>>> Workflow
>>>
>>>    1. I edit the ontologies in turtle syntax with the Geany text editor
>>>    (or a Turtle editor
>>>    http://blog.aksw.org/2013/xturtle-turtle-editing-the-eclipse-way ),
>>>    This allows me to make developers comments using "#" directly in the
>>>    source, see e.g. nlp2rdf/ontologies/nif-core.ttl
>>>    2. When I am finished I use rapper (
>>>    http://librdf.org/raptor/rapper.html) to convert it to rdfxml (
>>>    nlp2rdf/ontologies/nif-core.owl )
>>>    3. I am versioning the ontologies in a folder with the version
>>>    number, e.g. version-1.0 If somebody wants to find old ontologies, she can
>>>    find them in the GitHub repository, which is linked from the ontology. I
>>>    assume this is not often required, but it is nice to keep old versions. The
>>>    old versions should be linked to in the comment of the ontology, see the
>>>    header of nif-core.ttl
>>>    4. Then I use git push to push the changes to our server
>>>    5. (not yet) I use a simple OWL2HTML generator, e.g.
>>>    https://github.com/specgen/specgen
>>>    6. add yourself to http://prefix.cc, see e.g. http://prefix.cc/nif
>>>    7. The versions are switched and published by these .htaccess rules,
>>>    e.g.
>>>    RewriteRule .(owl|rdf|html|ttl|nt|txt|md)$ - [L]
>>>    # (in progress) RewriteCond %{HTTP_ACCEPT} text/html
>>>    # (in progress) RewriteRule ^nif-core$
>>>    /nlp2rdf/ontologies/nif-core/version-1.0/nif-core.html [R=303,L]
>>>
>>>    RewriteCond %{HTTP_ACCEPT} application/rdf+xml
>>>    RewriteRule ^nif-core$
>>>    /nlp2rdf/ontologies/nif-core/version-1.0/nif-core.owl [R=303,L]
>>>
>>>    RewriteRule ^nif-core$
>>>    /nlp2rdf/ontologies/nif-core/version-1.0/nif-core.ttl [R=303,L]
>>>
>>>
>>>
>>>
>>>
>>>
>>> Am 19.04.2013 16:05, schrieb Prateek:
>>>
>>>  Hello all,
>>>
>>>  I am trying to identify a system which will provide versioning and
>>> revision control capabilities specifically for ontologies. Does anyone have
>>> any experience and idea about which systems can help out or if systems like
>>> SVN, CVS can do the job?
>>>
>>>  Regards
>>>
>>>  Prateek
>>>
>>>  --
>>>
>>> - - - - - - - - - - - - - - - - - - -
>>> Prateek Jain, Ph. D.
>>> RSM
>>> IBM T.J. Watson Research Center
>>> 1101 Kitchawan Road, 37-244
>>> Yorktown Heights, NY 10598
>>> Linkedin: http://www.linkedin.com/in/prateekj
>>>
>>>
>>>
>>> --
>>> Dipl. Inf. Sebastian Hellmann
>>> Department of Computer Science, University of Leipzig
>>> Projects: http://nlp2rdf.org , http://linguistics.okfn.org ,
>>> http://dbpedia.org/Wiktionary , http://dbpedia.org
>>> Homepage: http://bis.informatik.uni-leipzig.de/SebastianHellmann
>>> Research Group: http://aksw.org
>>>
>>
>>
>>
>> --
>> Dipl. Inf. Sebastian Hellmann
>> Department of Computer Science, University of Leipzig
>> Projects: http://nlp2rdf.org , http://linguistics.okfn.org ,
>> http://dbpedia.org/Wiktionary , http://dbpedia.org
>> Homepage: http://bis.informatik.uni-leipzig.de/SebastianHellmann
>> Research Group: http://aksw.org
>>
>
>
>
> --
> Dipl. Inf. Sebastian Hellmann
> Department of Computer Science, University of Leipzig
> Projects: http://nlp2rdf.org , http://linguistics.okfn.org ,
> http://dbpedia.org/Wiktionary , http://dbpedia.org
> Homepage: http://bis.informatik.uni-leipzig.de/SebastianHellmann
> Research Group: http://aksw.org
>