Re: BNodes in OWL

From: Chuming Chen <chen@musc.edu>
Subject: Re: BNodes in OWL
Date: Sun, 19 Mar 2006 12:18:21 -0500

> Peter F. Patel-Schneider wrote:
> 
> >From: Chuming Chen <chen@musc.edu>
> >Subject: BNodes in OWL
> >Date: Wed, 01 Mar 2006 23:13:52 -0500
> >
> >>Dear All,
> >>
> >>Is it possible to have BNodes in OWL?
> >>
> >>Can anybody give an example or point some references?
> >>
> >>Thanks,
> >>
> >>Chuming Chen
> >
> >If you mean in OWL Full, any RDF graph is a valid OWL Full graph, blank nodes
> >and all.
> >
> >If you mean OWL DL or OWL Lite, then blank nodes (or, at least, something that
> >would translate into blank nodes) are allowed in certain places, the most
> >interesting being in the Individual construct.  In OWL DL and OWL Lite it is
> >possible to leave out the ID in an Individual construct, so in addition to
> >being able to say that John is a Person, via
> >
> >	Individual(John type(Person))
> >
> >you can also say that some object is a Person, via
> >
> >	Individual(type(Person))
> >
> >this anonymous object is just like a blank node.
> >
> >Look in the S&AS document 
> >	OWL Web Ontology Language
> >	Semantics and Abstract Syntax
> >	http://www.w3.org/TR/2004/REC-owl-semantics-20040210/ 
> >for more information.
> >
> >
> >Peter F. Patel-Schneider
> >
> In this case, how can we determine those blank nodes are equivalent when 
> they appear in two OWLs?
> 
> Thanks,
> 
> Chuming Chen

Which blank nodes, and two OWL whats?

If you are asking when two blank nodes are "equivalent" in an OWL KB,
the answer is to determine whether they have the same denotation in every
interpretation of the KB.

Peter F. Patel-Schneider

Received on Sunday, 19 March 2006 17:40:57 UTC