[Pellet-users] RDF to DIG 1.1 standalone converter

[Thorsten Liebig]

Hi Alexander,

as someone of the group which is working on DIG 2 some comments inline.

Michael Smith wrote:
> On Fri, 2008-07-11 at 15:33 +0100, Alexander Nazarov wrote:
> 
>> Yes, I'm aware that DIG 1.1 is less expressive than OWL DL, I just hope that
>> my ontologies would be quite simple.
>>
>> Yes, the problem is a platform - I was told by my boss that Java is
>> disfavored in our development. Our domain is NLP and consequently we are in
>> Perl.
>>
>> Could you tell me please: what is it, a bridge from Perl to Java?
> 
> A quick Google found two relevant perl extensions
> + http://search.cpan.org/~metzzo/Java-4.7/Java.pm
> + http://search.cpan.org/~rusekd/Java-Import-0.03/lib/Java/Import.pm
> 
> I have no experience with either and don't know if they can be used
> successfully with Pellet.
> 
>> About converter to DIG 1.1 - I found one called OWL2DIG:
>> http://projects.semwebcentral.org/projects/owl2dig/
> 
> That looks promising, if dormant.
> 
>> It looks like working OK. The only strange thing I notice:
>> Every class definition from OWL was converted to <equalc> axiom, i.e. for
>> class 'Thing':
>>     <equalc>
>>         <catom name="http://www.w3.org/2002/07/owl#Thing"/>
>>         <catom name="http://www.w3.org/2002/07/owl#Thing"/>
>>     </equalc>
>>
>> Could you tell me please, is it the same as <defconcept> introduction?
> 
> I think it will have the same effect for Pellet via DIG.

I'm not familiar with the translation library you use here. As far as
I can see from your posting (and a quick test by my own) this is harmless
here. Stating that a class is equivalent to itself doesn't add anything.

>> I actually subscribed to DIG forum mailing list:
>> dig-users at lists.sourceforge.net
>> but it looks dead.
> 
> You might try [1], it has more recent activity.

Yes, you can use [1] for DIG 1.1 or [2] for DIG 2 in case you have any questions.

Since DIG 2 heavily relies on OWL 2 it has to be delayed until OWL 2 is somehow
stable. As soon as this will happen we will have the DIG 2 specification ready and
libraries with transformation capabilities such as the OWL-API will quickly be
updated.
Meanwhile you can have a look at the current draft [3] and we would be happy to
receive your feedback to the protocol specs (both, in case you miss something as
well as if you think it's ok).

Regards,
Thorsten

[2] public-dig2-comments at uni-ulm.de
[3] http://www.informatik.uni-ulm.de/ki/DIG2/dig2.html