Re: N-ary relation and rdf star

> On Jan 4, 2021, at 8:55 PM, Jeen Broekstra <jb@metaphacts.com> wrote:
> 
> On Tue, 5 Jan 2021, at 01:21, Joy lix wrote:
>> Dear All:
>> I'm learning RDF star, what is the  difference between N-ary relation and RDF star?
>> N-ary relation : https://www.w3.org/TR/swbp-n-aryRelations/ <https://www.w3.org/TR/swbp-n-aryRelations/>
> 
> RDF* is an extension of RDF that aims to make modeling certain kinds of n-ary relations easier.

Really?? That is not what I have been reading up until now. RDF* replaces RDF reification: what it encodes is assertions /about/ a triple. Such as provenance information. That is quite different from extending a triple to an n-tuple in order to encode n-ary relations. 

Keeping things like this clear is why it is important to have a crisp semantics for RDF*. 

Pat Hayes

> As the working group note you mention shows, there are other ways to represent such relations in RDF without needing an extension, but they all have certain drawbacks. RDF* hopes to overcome some of those drawbacks. 
> 
>> This W3C Working Group Note  hasn't been updated since 2006. Can it still be used?
> 
> Yes. The approaches for modeling n-ary relations shown in that note are still as valid today as they were in 2006. It's just that RDF* gives you another option, that (hopefully, in some cases) will make things easier. 
> 
> Kind regards,
> 
> Jeen
> -- 
> Dr Jeen Broekstra (he, him)
> principal software engineer
> 
> jb@metaphacts.com <mailto:jb@metaphacts.com>
> www.metaphacts.com <https://www.metaphacts.com/>
> 
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