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Re: rdf inclusion

From: Dave Rager <drager@bbn.com>
Date: Mon, 22 Apr 2002 18:54:23 -0400
Message-Id: <p05100304b8ea446761bf@[]>
To: Drew McDermott <drew.mcdermott@yale.edu>
Cc: Jeff Heflin <heflin@cse.lehigh.edu>, www-rdf-logic@w3.org

My original impression is that by using a property or a class defined 
in some ontology, I am agreeing to use that ontology.  I believe this 
corresponds with Frank's answer to:

>    Does using a term defined by some ontology O in some
>    RDF graph G mean that G is using O?

Then Jeff came along and explains daml:imports is required, and 
presents an example.  He also indicates the correct way to use 
daml:imports for instance data is inside an rdf:description tag. 
This corresponds with what's in the language reference description 
document [1], though it doesn't describe how to use daml:imports with 
instance data.

I'm willing to add daml:imports statements to the SONAT data files 
since this seems to be the proper usage of DAML+OIL.

Since I had never seen daml:imports used in this way, I checked a few 
random  DAML+OIL instance files from homework 3 and the crawler.  I 
didn't see any that use daml:imports as Jeff described.  I did find:

a) daml:imports used in daml:Ontology header in the instance file, 
even though there are no ontology definitions in the file.

b) daml:imports used in a header tag describing the file:
<rdf:description rdf:about="">

c) No use of daml:imports

Does someone want to define the scope of the daml:imports statement. 
When applied to a resource (instance), does it only apply to the 
statements within the same rdf:description tag?  or the resource in 

If it is applied to a document as in b) do all DAML+OIL resources 
referenced within that document also use the imported ontology?  Or 
just to statements about the document itself?


[1] http://www.daml.org/2001/03/reference#Imports
Received on Monday, 22 April 2002 18:51:38 UTC

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