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Re: [ontolog-forum] Current Semantic Web Layer pizza (was ckae)

To: Pat Hayes <phayes@xxxxxxx>
Cc: "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>
From: Duane Nickull <dnickull@xxxxxxxxx>
Date: Wed, 05 Sep 2007 09:12:44 -0700
Message-id: <C304238C.6547%dnickull@xxxxxxxxx>
Pat:    (01)

Pet Hayes Schreibt:
>>Semantics is always contextual.    (02)

>Nonsense. Fortunately; because if it were true, semantics would be impossible.
>This assertion is like the idea that all
>assertions are contexual. It sounds plausible,
>but that 'all' makes it (literally) incoherent.    (03)

In general, I suspect I should have not used the "always" word but I still
believe that the context in which an instance of something occurs has a
great deal of impact on the semantics (what the thing means), albeit perhaps
not in 100% of instances.  My grammar is generally bad.    (04)

My memories are actually relevant in the subject of semantics given it is I
who was the recipient of the signal (diver down flag).  I see and interpret/
infer something from the flag (BTW - I did study semaphore and do know the
signal from a mariner perspective as well).    (05)

>> Semantics cannot exist without including the aspect of context.
> That is simply obviously false, since it does so
> exist and has done for maybe 70 years now.    (06)

Perhaps I worded this wrong.  Context is perhaps part of inference.  When
one (human, computer, dog, other) encounters a symbol/syntax instance, there
is an inference process.  We all draw meaning of some form at some level of
awareness (raising in tuple store based on impact perhaps).  That is perhaps
not part of declared semantics but I would still think if is relevant.    (07)

> This word "context" has been the cause of more
> wasted time in KR than almost any other. It is a
> deep tar-pit, not the least reason being that it
> is itself thoroughly contextual, ie it can be
> used to mean almost anything. There are many,
> many problems with the idea that ontology
> meanings are contextual.
Disagree that it is a complete waste of time given there are important
lessons learned.  Several papers and efforts have declared that it is an
open ended rathole and computationally too expansive to contemplate.  Even
the UN/CEFACT CCTS project which had a mere 8 context modifiers in its
framework could potentially have a very large number of semantic values.  It
is not even known at what level of granularity to determine a difference.
The CCCTS work could have 8 modifiers, each with values of up to 3000
enumerations or an extremely large number.    (08)

In general, I have no idea how to solve this issue but have worked enough on
XML artifacts to know that semantic declarations without context do not work
for all purposes.    (09)

An example - imagine a data element named "FirstNameOfParty".  An instance
is slightly different if it occurs within a hierarchy of
//PurchaseOrder/BuyerParty vs. //PurchaseOrder/SellerParty even though the
semantics of the lone data element do not change.    (010)

The semantics of each data element were declared in an attempt to allow
cognitive applications to automatically suggest mappings from one format to
another (in this case EDI to CBL).  The UBL effort immediately recognized
that context is utterly essential to the process as the context in which
something occurs affects many aspects of its semantics.    (011)

>There are extremely good
> reasons why any encoding of meaning in a
> formalism *intended to be used and archived on a
> network* should NOT be contextual (see
> http://www.ihmc.us/users/phayes/ikl/guide/guide.html#LogicForInt
> ). Moreover, we have found in the IKRIS work that
> any formalism which incorporates contexts can be
> mapped without loss of meaning into the
> context-free IKL formalism (by treating contexts
> as entities in the ontology itself, if necessary.
> But even that is usually more trouble than it is
> worth.)
Thanks for this - I'll take a look as I have an interest in this.
> KR work has been grappling with contextuality and
> contextual representations for over a decade now.
> The results are in, IMO, and they are negative.    (012)

I agree that the results are less than optimistic.  CCTS, UBL and several
researchers have all noted similar issues with the context.    (013)

Duane    (014)

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