What does the "_" mean in your example?

Dave Lebling

-----Original Message-----
From: Joshua TAYLOR [mailto:[email protected]] 
...
If you don't have those declarations in ontology, then you'll need to import 
some ontology that does.  E.g.,

_:ont a owl:Ontology .
_:ont owl:imports <http://example.org/namingOntology> .
:JohnDoe a owl:NamedIndividual . # if namingOntology declares :JohnDoe, you 
won't need this triple here :JohnDoe :hasName "John Doe" .

So yes, in general, if you've got an ontology O that declares some vocabulary, 
then a dataset that's based on that vocabulary should import O.

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