- From: Robert Stevens <robert.stevens@manchester.ac.uk>
- Date: Tue, 12 Sep 2006 07:49:08 +0100
- To: Alan Ruttenberg <alanruttenberg@gmail.com>, Marco Brandizi <brandizi@ebi.ac.uk>
- Cc: public-semweb-lifesci@w3.org
Robert. 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. > >-Alan > Dr. Robert Stevens Senior Lecturer School of Computer Science University of Manchester Oxford Road Manchester M13 9PL +44(0)161 2756251 Email:robert.stevens@manchester.ac.uk
Received on Tuesday, 12 September 2006 08:11:23 UTC