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Re: Can OWL model calculation knowledge

From: Dan Connolly <connolly@w3.org>
Date: Thu, 06 Sep 2007 17:38:37 -0500
To: Alan Ruttenberg <alanruttenberg@gmail.com>
Cc: s z <asdf_zs@yahoo.com.au>, public-webont-comments@w3.org
Message-Id: <1189118317.1829.119.camel@pav>


> On Sep 6, 2007, at 3:41 AM, s z wrote:
> 
> > Hi,
> >
> > I have encountered a problem that how to use OWL to model the  
> > knowledge of calculation.
> > A simple example can be seen as the following:
> >
> > The knowledge about calculating tax is expressed as:
> > Tax = TotalAmount * taxRate

It's also somewhat straightforward to express this sort
of thing using rules. Using N3 rules, it would look like:

{ ?TRX subtotal ?X.
  ?TRX taxRate ?Y.
  (?X ?Y) math:product ?TOTAL. }
=> { ?TRX tax ?TOTAL }.

For details on N3, see
http://www.w3.org/DesignIssues/Notation3

N3 is a somewhat experimental design; the W3C
Rule Interchange Format is working on a standard
for rule interchange. They have released drafts
such as:

RIF Core Design
W3C Working Draft 30 March 2007
This version:
        http://www.w3.org/TR/2007/WD-rif-core-20070330
Latest version:
        http://www.w3.org/TR/rif-core

I write about rules in a category of my blog...
http://dig.csail.mit.edu/breadcrumbs/taxonomy/term/30


Hmm... public-owl-dev might be a better mailing list
than public-webont-comments, as we're not really
discussing details of the text of the spec.

On Thu, 2007-09-06 at 18:24 -0400, Alan Ruttenberg wrote:
> OWL can not calculate the results of such expressions.
> 
> It can model the calculation, in the sense of supplying enough  
> information to some interpreter to do that calculation. See for  
> example: http://neno.lanl.gov/Home.html

> -Alan

> >
> > I could not figure out a way to do it in OWL.
> > Can OWL only express the logical relations among classes?
> > Please help? Many thanks!
> >
> > Su

-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
Received on Thursday, 6 September 2007 22:38:58 UTC

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