Hello,
I finally got a chance to look through the new SPIN API, and started
with trying to run the SPIN rules on the spinsquare ontology. I think
I'm pretty close, except it's choking on the line in the spin:rule
construct query that uses the multiplication symbol, i.e.
LET (?area := (?width * ?height)) .
Stepping through the code, I can see that this gets turned into what I
would guess must be a property function named sp:mul:
LET (?area := sp:mul(?width, ?height))
However, I don't think my execution environment has access to that
function and thus the query doesn't return anything. Is there any way I
could get this function and make it available to my execution
environment, and is that documented anywhere? Or is that not part of
the release?
Thanks!
Jeff
-----Original Message-----
From: Holger Knublauch [mailto:hol...@topquadrant.com]
Sent: Saturday, March 07, 2009 12:38 PM
To: topbraid-composer-users@googlegroups.com
Subject: [tbc-users] SPIN API is now open source
Dear users,
we have had several requests from people who would like to integrate
SPIN functionality (SPARQL-based constraint checking, inferencing,
user-defined functions) into their own applications. In order to
encourage the wider adoption of SPIN in the community, we have therefore
decided to make the key features of our SPIN implementation open source:
http://www.topquadrant.com/topbraid/spin/api/
The SPIN API is built on Jena and provides the following features:
* Converters between textual SPARQL syntax and the SPIN RDF
Vocabulary
* A SPIN-based constraint checking engine (via spin:constraint)
* A SPIN-based inferencing engine (via spin:rule and
spin:constructor)
* Support to execute user-defined SPIN functions using Jena/ARQ
* Support to execute user-defined SPIN templates
The license has been selected to allow open source projects (from
universities etc) to use SPIN without further complications. For closed
source users, we offer a commercial license that also provides business
users assurance and support. With this policy we hope to encourage
researchers to provide their (open source) implementations back to the
community to help the SPIN community grow.
The SPIN API is currently in beta, and the official 1.0 release is
scheduled in conjunction with TopBraid 3.0 in the next few weeks. We
appreciate your feedback in the meantime.
Kinds regards,
Holger
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