On Thu, Jun 17, 2021 at 12:36 PM Zavras, Alexios <[email protected]>
wrote:

> You see that “Relationships” (in your parlance) can appear on any of the
> three columns.
>

Ahh, but while predicates can be subjects, not all subjects can be
predicates.

  isGenderOf    is-a         Property       -- valid
  connects-to   connects-to  connects-to    -- might be valid
  isGenderOf    Alice        Bob            -- not valid
  isGenderOf    is-a         tosser         -- valid?

An information model is made of classifiers (type definitions), and a
classifier determines whether a putative instance is an actual (valid)
instance of the type.  In the RDF universe some strings, like Alice, green,
or cicada, are not predicates, therefore there must be a list of strings
that are.  My question is if there is a corresponding list of strings that
can be objects.  I assume that there is not.

Dave


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