Tuesday, May 22, 2012

OWLED and ESWC invitation

Next week, during OWLED, we will have a presentation about Quest. After that I'll stay for ESWC. This would be a great opportunity to meet people interested in OBDA and -ontop-, to have discussion and/or hands-on sessions. Please contact me if you would be interested in something like that, we can arrange some time during the conferences.

- Mariano

v1.7-alpha-b1479 is now available

A new build for -ontopPro- v1.7-alpha is now available. Highlights of this build include:

  • Support for UNION in SPARQL queries.
  • Support for SQL Server (needs testing)
  • Improved T-mappings optimization, new produces much fewer and faster SQL queries in virtual ABox mode.
  • The SQL analyzer now understands IS NULL and IS NOT NULL
  • Fixed support for DB2 and Oracle in virtual ABox mode.
  • Multiple bug fixes 
For a full description of the changes see our changelog.

Thursday, May 17, 2012

New build next week (UNION and COUNT!)

A new build will be coming next week with new whistles and bells:

  • First version with support for UNION and COUNT 
  • Support for SQL Server
  • Better T-mappings algorithm, hence faster and MUCH smaller SQL queries in virtual ABox mode.
  • Better SQL parsing (hence better SQL performance in virtual ABox mode)
  • Fixed support for MySQL, Oracle and DB2.
  • Fixed uppercase/lowercase issue with DB schemas.
Stay tuned!

Friday, May 4, 2012

Build 1446 now available

Build 1446 for v1.7-alpha is now available. This build fixes a small bug where mappings that introduce concrete individuals would not be rendered properly by -ontopPro-. The kind of problematic mapping would be:

<"&:;people/{$id}"> :knows <http://physics/Stephen_Hawking>
SELECT id FROM physicists

The problem would rise when there is no prefix for any fragment of <http://example/physics/Stephen_Hawking>

We also added coloring for individuals in mappings.

New paper available

A new paper describing Quest (our reasoner for OWL2QL/RDFS and SPARQL) is now available here. The paper describes OBDA in general, and the functionality and optimizations available in Quest.

Thursday, May 3, 2012

-ontopPro- v1.7-alpha build 1440 is now available


Dear -ontop- users,

We are pleased to announce that v1.7-alpha build 1440 is now available for download from our website. This build fixes several bugs from the previous build including a severe bug that crashed the plugin in some system configurations.

It is highly recommended that everybody upgrades to the new version.

We would also like to take this opportunity to invite you to interact with us. We are working hard to stabilize the current alpha version, and to finish all features required for you to use -ontop- in your applications. We would appreciate it if you could send us issues, bug reports, suggestions or general feedback you may have.

Even better, we would love to have live discussions and/or hands-on sessions with anybody interested. Please contact us if such an event would be interesting/useful for you.

Best regards,
The -ontop- Team

Tuesday, May 1, 2012

-ontop- of KR and OWLED (ESWC)

In the next months we will be presenting Quest, -ontop- and research related to OBDA at the KR conference in Rome and at the OWLED workshop in Greece (collocated with ESWC).

We would be really excited to meet people interested in -ontop- and OBDA projects in general. Please, if you would like to arrange a gathering contact us. We are open for anything, e.g., tutorials, hands-on sessions or just a light chat ;-)

See you in Rome and/or Heraklion!

New build for v1.7-alpha this week

Quick update, this week we will have a new build available that fixes a serious packing issue we had in the previous build. If you where using WindowsXP or Linux and couldn't start the plugin due to NULL pointer exceptions the new build will solve the issue. 

Stay tuned ;)