On Feb 18, 2009, at 12:07 PM, Ian Bailey wrote: (01)
> Hi,
>
> As part of an ontology-based reference data demonstrator I'm working
> on, I
> decided to go look what was out there for free, or at least under
> creative
> commons. I downloaded the OpenCyc OWL file and loaded it into my OWL
> editor
> (all 124MB of it!). (02)
Bear in mind that OWL isn't expressive enough to capture more than a
fraction of what is in OpenCyc. (03)
> I seem to be finding lots of orphan classes there - i.e. ones that are
> sitting right at the top of the sub-super hierarchy. When I go look
> in the
> OWL file itself, these classes seem to be in the file twice - once
> with
> their sub-super relationship and once without. (04)
I don't know for sure, but that sounds like an artifact of the
translate-to-OWL process. It may be because OWL-DL does not allow a
class to have properties or be in other classes; one common work-
around is to have two "copies" of a class, one being the DL class and
the other being a DL individual, which then cannot take part in DL
subclass relationships. Check to see that the "without" entities
really are OWL classes: if not, the above is likely correct. (05)
>
>
> As the file is so big, I can't be sure of what the problem is - it
> may well
> be my OWL Editor struggling with such a large file. (06)
that too. :-) (07)
Sorry I can't help more. (08)
Pat H (09)
>
>
> Has anyone else encountered this problem, and if so do you know if
> there is
> a corrected version available ? The only way I can find for
> contacting
> OpenCyc is through their SourceForge forum, but it doesn't appear to
> be that
> active.
>
> Cheers
> --
> Ian
> www.modelfutures.com
>
>
>
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