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[p4-feedback] Why max operator doesnt work when min operator works

Lorenz Bühmann buehmann at
Wed Nov 13 02:26:28 PST 2013


for the "FunTitles". It's impossible for a reasoner to infer that "Yes 
Man" belongs to this class because the Open World Assumption holds in 
OWL ontologies, i.e. there might be another genre which is unknown. In 
this case you would have to use something like SPARQL to simulate a 
Closed World Assumption or find a reasoner which allows for "closing the 

On 11/13/2013 11:11 AM, buksy wrote:
> Hello,
> I've just started using Protege and ontology and it looks interesting. I've
> made a little ontology about movies from IMDB. Unfortunatelly, there are few
> things I don't understand, which I would like to ask you experts for help.
> Here is my ontology  movies_post_rdf.owl
> <>
> (  owl <>   |  rdf
> <>  )
> You can see I have MultipleYearsCreationTitles class which selects all
> Titles (movies/Tv series) which have been in production for more than 1 year
> (kinda equivalent to Tv series). Each title has data property
> "hasYearRelease", tv series have multiple of them. So I can select titles in
> MultipleYearsCreationTitles with "/Titles and (hasYearRelease min 2
> Literal)/". I have also LessThan10YearsCreationTitles class which selects
> titles with "/Titles and (hasYearRelease max 10 Literal)/". Now, why doesn't
> this work with max operator if it works with min operator (I expect Alias tv
> serie to be selected in "LessThan10YearsCreationTitles")?
> There is also "FunTitles" class which contains titles that have only
> FunGenres (example is Yes Man which have only "fun" genres (comedy &
> romance)). So why is "FunTitles" class empty after starting reasoner?
> Thank you in advance :)
> --
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