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Re: Playing with sets in OWL...

From: Robert Stevens <robert.stevens@manchester.ac.uk>
Date: Tue, 12 Sep 2006 07:49:08 +0100
Message-Id: <>
To: Alan Ruttenberg <alanruttenberg@gmail.com>, Marco Brandizi <brandizi@ebi.ac.uk>
Cc: public-semweb-lifesci@w3.org

00:24 12/09/2006, Alan Ruttenberg wrote:

>On Sep 10, 2006, at 8:21 AM, Marco Brandizi wrote:
>>- ...how much are RDF and OWL scalable? Let's take a small data set
>>of 100 microarray experiments, with 10k probe sets x 10
>>hybridiazations. We would have (at least) 10 millions numbers to
>>handle, plus several annotations, plus inference, etc. An RDF
>>backend that directly maps SQL to RDF should still work out, but
>>what about an in-memory OWL reasoner? And what about integrating
>>larger amounts of microarray data, crawled from different sources
>>on the web (which should be a goal of the Semantic web)?
>Will not scale in-memory at the moment, though I haven't experimented
>with pellet using 64bit java and gobs of memory.
>Instance store is a relational backend for OWL instances with limited
>kinds of reasoning and query support.   http:// 
>instancestore.man.ac.uk/, http://instancestore.sourceforge.net/ .
>There is a new version being worked on - if you are interested in
>trying to work with them, then I can look up the contact.
>Also there is Oracle's RDF store, which will start to have some OWL
>reasoning features in the near future.
>Reminder: Open world means you only need to actually represent
>explicitly what you will need for your computation (and to convey
>it's meaning to the outside world).
>>That's another point of current state-of-art of the Semantic Web: I
>>am not an expert, but aren't we still missing some needed features?
>>Like: efficient RDF handling, SQL mapping, federated data stores,
>>distributed reasoning... relational tehory is less expressive, but
>>for the moment, relational databases, having been here for ages,
>>seem more reliable and efficient.
>Yes. These are early days. Welcome to the frontier :)
>The hope is that the investment we make now will lead to greater and
>more effective sharing of knowledge, and to surprising discoveries
>enabled by making it much easier to get, understand, and integrate
>knowledge/data than it currently is.

Dr. Robert Stevens
Senior Lecturer
School of Computer Science
University of Manchester
Oxford Road
M13 9PL
+44(0)161 2756251
Received on Tuesday, 12 September 2006 08:11:23 UTC

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