W3C home > Mailing lists > Public > www-rdf-comments@w3.org > October to December 2003

Re: RDF Semantics, non-lean RDF graphs, and redundancy of content

From: Graham Klyne <GK@ninebynine.org>
Date: Tue, 09 Dec 2003 10:04:02 +0000
Message-Id: <5.1.0.14.2.20031209100159.00bb1b18@127.0.0.1>
To: pat hayes <phayes@ihmc.us>, Ossi Nykänen <onykane@butler.cc.tut.fi>
Cc: www-rdf-comments@w3.org

At 09:51 08/12/03 -0600, pat hayes wrote:
>>In addition, suppose I'm asserting the following:
>>
>><#pat> <#child> [ <#age> "4" ] , [ <#age> "3" ].
>
>? What does that mean? That the age is either 3 or 4? There is no way to 
>exactly model this in RDFS, though an ALT container would probably do as a 
>pragmatic device. Conforming RDF engines are not obliged to follow the 
>intended semantics of ALT, however.  (It is quite tricky to implement; 
>disjunctions raise the complexity level of inference to new heights.)

FWIW, that Notation3 expands out as this:

<#pat> <#child> _:a .
<#pat> <#child> _:b .
_:a <#age> "4" .
_:b <#age> "3" .

So no ALTS there, just two children.

#g


------------
Graham Klyne
For email:
http://www.ninebynine.org/#Contact
Received on Tuesday, 9 December 2003 07:14:07 GMT

This archive was generated by hypermail 2.2.0+W3C-0.50 : Friday, 21 September 2012 14:16:33 GMT