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[protege-owl] Variations in owl output of actual identical ontologies

Samson Tu swt at stanford.edu
Mon Aug 6 14:08:54 PDT 2007


See Protege OWL FAQ entry: 
http://protege.stanford.edu/doc/owl-faq.html#irregular

Protege 3.x uses Jena to save files and has no control over how the 
files look.



Christian Knuepfer wrote:
> Hi,
> 
> Some days ago I sent already a question to this list, but unfortunately 
> there was no answer. So I'll try to ask a little bit different...
> 
> I create a little owl file *) with Protege 3.2.1 (test.1.owl). After 
> restarting Protege and loading the file I just wrote it back (test.owl). 
> Nothing was changed, no settings were altered. Now look at the 
> differences between this two files:
> 
> ~/tmp/test > diff test.owl test.1.owl
> 11,13d10
> <     <rdfs:seeAlso>
> <       <owl:Thing rdf:ID="Thing_2"/>
> <     </rdfs:seeAlso>
> 16c13,16
> <     <rdfs:isDefinedBy rdf:resource="#Thing_2"/>
> ---
>  >     <rdfs:isDefinedBy>
>  >       <owl:Thing rdf:ID="Thing_2"/>
>  >     </rdfs:isDefinedBy>
>  >     <rdfs:seeAlso rdf:resource="#Thing_2"/>
> 
> I found this result quite annoying! Such a big diff between two 
> (semantically) identical "ontologies". Indeed this behaviour of the 
> Protege owl export makes revision control of ontologies almost impossible!
> 
> What do you think about this. Maybe there were already discussions on 
> this topic on this list, but I couldn't find them...
> 
> Cheers,
> 
> Christian.
> 
> *) Don't worry about the content it's just to illustrate the point.
> 
> 
> ------------------------------------------------------------------------
> 
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-- 
Samson Tu                    email: swt at stanford.edu
Senior Research Scientist    web: www.stanford.edu/~swt/
Stanford Medical Informatics phone: 1-650-725-3391
Stanford University          fax: 1-650-725-7944




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