Search Mailing List Archives

Limit search to: Subject & Body Subject Author
Sort by: Reverse Sort
Limit to: All This Week Last Week This Month Last Month
Select Date Range     through    

[protege-discussion] Nothing class (newbie question)

Matthew Horridge matthew.horridge at
Wed Mar 6 11:24:58 PST 2013


owl:Nothing is interpreted as the empty set.  It does not have any instances.  Because it is interpreted as the empty set, it is a subclass of every other class (since the empty set is a subset of every set).  owl:Thing appears at the top of the class hierarchy, whilst owl:Nothing appears at the bottom of the class hierarchy.  Hope this helps.



On 6 Mar 2013, at 11:12, André Luiz Tietböhl Ramos wrote:

> Hello,
> What does the Nothing class mean actually?  Assuming its superclasses are inferred, I have many in it and do not know what this aspect means for sure.
> Thanks in advance.
> -- 
> André Luiz Tietböhl Ramos
> _______________________________________________
> protege-discussion mailing list
> protege-discussion at
> Instructions for unsubscribing:

More information about the protege-discussion mailing list