Will a predicate C be able to link two nodes A and
B that may themselves be predicates?
It seems like this would be another useful side-effect of making
predicates first-class citizens...
> Date: Wed, 11 Jun 2014 09:20:31 -0700
> From:
jackpark@xxxxxxxxx
> To:
ontolog-forum@xxxxxxxxxxxxxxxx
> Subject: Re: [ontolog-forum] Requesting Opinions on the
Benefits of Predicates as Nodes
>
> I see an additional benefit, but not necessarily
affiliated with the
> way you describe an 'implicit node' -- where a predicate
appears,
> still, to be a second-class citizen in the graph.
>
> Let me explain.
>
> Mostly, it would seem that a predicate in a triple
performs the task
> of linking subject and object; it has no other reason for
being there
> other than to complete the assertion, e.g. A relates to
B.
>
> But, consider this: if a specific *instance* of a
predicate exists as
> a connective between two objects, then it can be said to
carry the
> full semantics of the assertion itself. The instance is
not an
> 'implicit' node: it is a vertex like any other in a
graph.
>
> If I say: A cause B, then the node which is the 'cause'
predicate can
> carry the full semantics of the triple itself. It's not
just your
> father's predicate anymore; it's a first class citizen.
>
> Why do I care?
>
> Consider that said predicate has entails a possibly
complex biography.
> Who discovered it? What evidence supports it? What
debates are in play
> about it?
>
> I can't assign or otherwise link that biography to either
A or B, but
> only to the specific predicate that ties them together.
>
> If I might add, I will assert that predicates as first
class citizens
> is perhaps the only difference between an RDF graph and a
topic map.
> I've built topic maps with RDF using the BigData RDF
store; they work
> just fine, can import and export from, e.g. OWL
documents, but with a
> loss of information when the topic map becomes OWL.
>
>
> On Wed, Jun 11, 2014 at 8:59 AM, Frank Guerino
<Frank.Guerino@xxxxxxxxx> wrote:
> > Hi All,
> >
> > For a number of years, we've been working with Data
Driven Synthesis as a
> > means of rapidly generating Data Networks/Graphs and
the Knowledge
> > Constructs (e.g. Library Catalogs, Indexes,
Taxonomies, Visualizations,
> > etc.) that help humans make easier & better
sense of them (If interested,
> > see NOUNZ). Like many other Graph representations,
we use "triples" or
> > "triplets" to help represent Semantic Relationships,
where descriptive
> > Predicates are used as the binding between Subject
Nodes and Object Nodes.
> >
> > To date, we've only treated Subjects and Objects as
"Nodes" but we've always
> > known that we can (and have planned to) implement
and treat Predicates as a
> > special type of "implicit" Node, as well. (Time
didn’t' allow us to get to
> > doing so, until now.) We believe that doing so
grants users of Graphs
> > certain benefits. We've identified three (3)…
> >
> > #1: The first and obvious advantage is that users
can now enter a Graph from
> > any Edge/Predicate as easily as they can enter from
any Node, and start to
> > traverse the Graph based on that point of entry.
> >
> > #2: The second advantage of treating Predicates as
Nodes is that a Predicate
> > can now be used as an "Index" or "Pointer" that
allows users to quickly find
> > all Nodes which are tied to said Predicate (or any
Predicates that match
> > certain traits). In other words, it's a way of
asking the Graph to quickly
> > identify all Nodes that are connected to a specific
Edge/Link/Predicate (or
> > any of a common set of Predicate traits). This means
that, in addition to
> > being able to ask "Node-oriented" questions of the
Graph, you can now also
> > ask "Predicate/Edge-oriented" questions of the
Graph, as well. This leads
> > to even more complex scenarios of being able to ask
questions of, both,
> > Nodes and Edges.
> >
> > #3: The third advantage (based on the second) is
that traversal of a Graph
> > can be even quicker, leading to even shorter paths,
because instead of only
> > traversing a Graph from Node-to-Node-to-Node,
through Nodes, users can now
> > traverse from any Edge/Predicate to any other
Edge/Predicate, through
> > Edges/Predicates.
> >
> > My question to the Community: Aside from the above
three, do you see any
> > other benefits that we're missing?
> >
> > Thanks for your help.
> >
> > My Best,
> >
> > Frank
> > --
> > Frank Guerino, Chairman
> > The International Foundation for Information
Technology (IF4IT)
> >
http://www.if4it.com
> > 1.908.294.5191 (M)
> >
> >
> >
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