Mark James wrote:
Hi,
Thanks for the link. I hadn't seen this.
An alternative approach for simple scenario's is to use the
inverseFunctionalProperty. This will allow virtuoso to infer a sameAs
link if two instances have the same data within an attribute, usually
a primary key.
Eg two instances of Customer with a customerID attribute of 1234 for
both. If customerID is an inverseFunctionalProperty then virtuoso will
infer a sameAs link for the two Customers.
OWL2 has the hasKey inference which would allow something
similar across multiple keys. OWL2 isn't yet supported by virtuoso though.
Kingsley are there any plans to support this in the near term?
OWL2 support is coming, but priority wise its sits behind:
1. Delta Engine -- basically diffs between Virtuoso Quad Stores which
is vital to an HTTP based Dynamic Data Exchange rehash using PubSubHubBub
2. Federated SPARQL -- replicating our federated SQL virtualization in
the SPARQL realm (we already have crawling built into SPARQL via Sponger
Crawling, but we can make it smarter via cost-optimizer based
communications with remote SPARQL endpoints with fidelity scoped to the
metadata we can cull from the remote endpoint) .
Kingsley
Cheers
Mark
On 20 May 2010 10:28, <[email protected] <mailto:[email protected]>>
wrote:
Great. I'll try that.
I also just found an RDF linking framwork called Silk which looks
pretty good.
1. http://code.google.com/p/silk/
On Wed, May 19, 2010 at 11:02 PM, Kingsley Idehen
<[email protected] <mailto:[email protected]>> wrote:
[email protected] <mailto:[email protected]> wrote:
If I have two datasets in RDF with some common entries,
how can I generate owl:sameAs links? Is there a way to do
this within Virtuoso, or do I have to make a separate
program? I would guess in either case it would be done by
selecting all entries from one of the datasets, and then
for each entry do a sparql query to select one or more
candidates for linking and then apply some rules to
determine whether or not to make a link?
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SPARQL is a formidable rules language.
Make a SPARQL CONSTRUCT from the two RDF datasets (which would
have their own Graph IRIs if hosted in Virtuoso).
Basically use SPARUL.
Links:
1. http://docs.openlinksw.com/virtuoso/rdfsparql.html#rdfsparul
2.
http://virtuoso.openlinksw.com/presentations/SPARQL_Tutorials/SPARQL_Tutorials_Part_2/SPARQL_Tutorials_Part_2.html
-- see INSERT, UPDATE, DELETE examples .
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Regards,
Kingsley Idehen President & CEO OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
<http://www.openlinksw.com/blog/%7Ekidehen>
Twitter/Identi.ca: kidehen
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President & CEO
OpenLink Software
Web: http://www.openlinksw.com
Weblog: http://www.openlinksw.com/blog/~kidehen
Twitter/Identi.ca: kidehen
