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Re: Relations in RDF

From: James Malone <malone@ebi.ac.uk>
Date: Wed, 04 May 2011 17:26:00 +0100
Message-ID: <4DC17E18.8050503@ebi.ac.uk>
To: public-semweb-lifesci@w3.org, Mark Wilkinson <markw@illuminae.com>
Hi Mark,

Makes sense. And in fact this was how I saw the land lying when I came 
to look at this. Thanks for thoughts.



On 04/05/2011 17:00, Mark Wilkinson wrote:
> Heya,
> My personal take on this is that it becomes a trade-off.  More 
> granular predicates generally means that you are creating less 
> descriptive Classes (i.e. that the Class does not have a lot of 
> class-defining properties).  So while more descriptive predicates are 
> good for SPARQL querying, they are less good for DL reasoning (class 
> reasoning is ~more powerful than predicate reasoning)
> That's a superficial view, but it's something that we have also been 
> struggling with.  We've tended to try bridging the two approaches by 
> defining elaborate classes with "basic" predicates, and then minting 
> new, more descriptive predicates that join these classes as well.
> Don't know if I am explaining myself clearly :-/
> M
> On Wed, 04 May 2011 08:42:21 -0700, James Malone <malone@ebi.ac.uk> 
> wrote:
>> Hi Scott, All,
>> I was wondering what the general take is on predicates in RDF 
>> representations used by the HCLS group. I've been looking at our RDF 
>> model for Gene Expression Atlas at EBI and presently I'm using the 
>> same "is_about" relation for a lot of the predicates as this is the 
>> lowest level of constraint from the OBO Foundry folks for some of 
>> these information relations. Alan Ruttenberg tells me that empirical 
>> evidence suggests that using a larger number of relationships 
>> correlates to poorer ontologies. However, I've also been told from 
>> various RDF advocates that having more granular level predicates is 
>> useful for querying. Are there any thoughts from the group on this? I 
>> have no preconceptions here (I have no reason to disbelieve Alan or 
>> the RDF folks) so open to thoughts and suggestions.
>> Cheers,
>> James

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Received on Wednesday, 4 May 2011 16:26:39 UTC

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