RE: [Fwd: [deri-research] FW: OWL Full reasoning]

Doug,

This just dropped in my inbox, but it is dated 4 days ago, and its contents
are, superfically seen, the same as you sent earlier. A hick-up of the
e-mail universe?

Regards,
Hans

-----Original Message-----
From: semantic-web-request@w3.org [mailto:semantic-web-request@w3.org] On
Behalf Of doug foxvog
Sent: Friday, August 19, 2005 6:11 PM
To: semantic-web@w3.org; semantic-web-request@w3.org;
hans.teijgeler@quicknet.nl
Subject: [Fwd: [deri-research] FW: OWL Full reasoning]


> From: semantic-web-request@w3.org 
[mailto:semantic-web-request@w3.org] > On Behalf Of Hans Teijgeler
> Sent: Donnerstag, 18. August 2005 14:50
> To: semantic-web@w3.org
> Subject: OWL Full reasoning

> Hi,

> I have worked out an example of a reasoning problem that we have:
> http://www.infowebml.ws/topics/RDF-OWL/85-reasoning/example.htm

There are some problems with the description in this example resulting
from inconsistency as to whether various classes are first-order
(classes of individuals) or second-order (classes of classes of
individual) or even third order (classes of classes of classes of
individual).  Consistency here is necessary before any attempt is
made for reasoning to solve the problem.

* The description of ValidConnectionPerANSI-B16.5 indicate that it is
   a second-order class, i.e. its instances are first-order classes, yet
   the question is posed whether an instance of DirectConnection, i.e.
   an individual, is an instance of a subClassOf of
   ValidConnectionPerANSI-B16.5 both in the text and in the figure.
   + As a second-order class, this should probably be renamed
     ValidConnectionTypePerANSI-B16.5
   + The class of all valid connections Per ANSI-B16.5 is useful, having
     2"-150/300#RFFlangedConnection as a subclass. This corresponds to
     the existing name, ValidConnectionPerANSI-B16.5, but would not be an
     instance (much less a subclass) of ClassOfClasses.  It would be
     typed as a ClassOfIndividual.
* The figure depicts ValidConnectionPerANSI-B16.5 as a third-order
   class, i.e. its instances are second-order classes, because the
   link between it and ClassOfClasses is subClassOf instead of type.
   This should be a type link if the second-order class were meant.
* The three classes, ClassOfDirectConnection, ClassOfIndividual, and
   ClassOfInanimatePhysicalObject are first-order collections according
   to one set of depicted links, yet second-order collections according
   to another set of links.  Assuming these are intended to be second-
   order collections:
   + The link from 2"-300#RFFlange to ClassOfIndividual should be
     type, not subClassOf
   + The link from 2"-300#RFFlange to ClassOfIndividual should be
     type, not subClassOf
   + The link from 2"-150/300#RFFlangedConnection to
     ClassOfDirectConnection should be type, not subClassOf
* The links from DirectConnection to PossibleIndividual should be
   classOfSide1 and classOfSide2 instead of side1 and side2
* The classOfSide1 and classOfSide2 links from ClassOfDirectConnection
   to ClassOfIndividual have different meaning than the classOfSide1 and
   classOfSide2 depicted from 2"-150/300#RFFlangedConnection.  Those from
   2"... indicate that any side1 link from an instance of 2"150/300... is
   an instance of 2"-300#RFFlange (and side2 links are instances of
   2"-150#RFFlange).
   The links from ClassOfDirectConnection should be classOfClassOfSide1/2
   indicating that instances of ClassOfDirectConnection should have
   classOfSide1/2 to instances of ClassOfIndividual.

* The first check in Reasoning for Phase 2 should check whether there is
   a subClassOf DirectConnection, not of ClassOfDirectConnection, with
   the described properties.  This class should be *typed* with the
   class, ClassOfDirectConnection.

* The second check should be whether the found OWL class is typed with
   the *instance*, not subClassOf, ClassOfClass labelled
   ValidConnectionTYPEPerANSI-B16.5 .  Alternatively, it could check
   whether the found class was a subClassOf a re-defined
   ValidConnectionPerANSI-B16.5, which would be a subClassOf
   DirectConnection (and be typed with ClassOfIndividual).

For the figure, the following type relations should hold:

Individuals				of type
	DirectConnection-Yellow		DirectConnection
	FlangeOnPipeA265h		PhysicalObject, 2"-150#RFFlange
	FlangeOnPumpP101		PhysicalObject, 2"-300#RFFlange

First-Order Classes
	DirectConnection		ClassOfDirectConnection
	PossibleIndividual		ClassOfIndividual
	PhysicalObject			ClassOfIndividual
	2"-150/300#RFFlangedConnection *ValidConnectionTypePerANSI-B16.5
	2"-300#RFFlange			ClassOfInanimatePhysicalObject
	2"-150#RFFlange			ClassOfInanimatePhysicalObject
	ValidConnectionPerANSI-B16.5*	ClassOfDirectConnection

Second-Order Classes
	ClassOfDirectConnection		ClassOfClasses
	ClassOfIndividual		ClassOfClasses
	ClassOfInanimatePhysicalObject	ClassOfClasses
	ValidConnectionTypePerANSI-B16.5 ClassOfClasses

subClassOf relations should obtain between:
	PhysicalObject			PossibleIndividual
	DirectConnection		PossibleIndividual (?)
	2"-150#RFFlange			PhysicalObject
	2"-300#RFFlange			PhysicalObject
	2"-150/300#RFFlangedConnection	ValidConnectionPerANSI-B16.5
	ValidConnectionPerANSI-B16.5	DirectConnection
	ValidConnectionTypePerANSI-B16.5 ClassOfDirectConnection
	ClassOfInanimatePhysicalObject	ClassOfIndividual
	ClassOfDirectConnection		ClassOfIndividual

* Note that the figure does not have both ValidConnectionPerANSI-B16.5
   and ValidConnectionTypePerANSI-B16.5

> I have the following questions to the OWL community:
> 1.      Given the fact that this is clearly an implementation of OWL
>         Full, can any OWL reasoner handle this at present?

It has to be cleaned up if anything is to handle it.

I don't know of a OWL-Full reasoner.

OpenCyc can currently handle the cleaned-up version (if encoded in CycL
instead of in OWL).

> 2.      If not yet, may we realistically expect such a capability to
>         be available by the year 2010?
> 3.      And if not, why is there OWL Full?

> Regards,
> Hans

> _______________________
> Hans Teijgeler
> ISO 15926 specialist
>  <http://www.InfowebML.ws> www.InfowebML.ws
>  <mailto:hans.teijgeler@quicknet.nl> hans.teijgeler@quicknet.nl
> phone +31-72-509 2005

==========================================================
douglas foxvog	  doug.foxvog@deri.org	 +353 (91) 495 150
Digital Enterprise Research Institute (DERI)
National University of Ireland, Galway
Galway, Ireland				http://www.deri.ie
==========================================================

Received on Tuesday, 23 August 2005 09:05:25 UTC