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:[EMAIL PROTECTED]
