Hi Paolo, First and foremost I apologise upfront for talking off-subject here in regards to Jena in specific.
I am currently working on a plug-in for Solr which refines user queries based on ontology classes and I am using Jena to wrap around my ontology models to provide this functionality. Immediately I am interested in experimenting with LARQ and SARQ. Out of curiosity, can you please provide some use case or personal usage for these frameworks as it would enable me to get at least an abstract sense of how I may be able to use LARQ, prior to SARQ for my own needs. Any comments would be great Thank you Lewis ________________________________________ From: Paolo Castagna [[email protected]] Sent: 16 March 2011 19:00 To: [email protected] Subject: Re: ARQ + Lucene Nikolaos Abatzis wrote: > All: > > I just did a check on the 2.6.4 Jena bundle and I see that even the latest > ARQ (2.8.7) seems to use the lucene-core-2.3.1. > > Are there any plans to port ARQ so that it uses a more recent version of > Lucene. 2.3.1 is kind of ancient, current in the 2.x series is 2.9.4 > and my understanding is that it uses Java 1.4. There is also a 3.x series > that uses Java 1.5. per the lucene docs, the latest versions offer > significant enhancements and have fixed memory leaks, etc... "Lucene 2.3.1 is kind of ancient", I agree. :-) Yes, the plan is to extract LARQ as a separate module (which will depend on ARQ). You can look here: https://jena.svn.sourceforge.net/svnroot/jena/LARQ/trunk/ As you can see, it is using Lucene 3.0.3 (and it is backward compatible with 2.9.x ... as just a drop-in replacement if somebody needs an older version of Lucene). We are currently waiting the "all clear" to move source code from SourceForge to the Apache SVN repository. Once we do that, little changes are necessary in the ARQ source code to dynamically look for LARQ and wiring it in (if present in the class path). The LARQ separate module has already a few improvements (i.e. avoiding duplicates with subsequents updates and removals). Still pending: - a way to support RDF Datasets in addition to Jena Models and proper assemblers. - a tool to make it easier to build Lucene indexes pointing to a TDB location. - (at one point, I'd like to see LARQ in Fuseki ;-)) Later: - Solr? https://github.com/castagna/SARQ - ElasticSearch? https://github.com/castagna/EARQ To checkout LARQ and compile it type: svn co https://jena.svn.sourceforge.net/svnroot/jena/LARQ/trunk/ LARQ cd LARQ mvn package Let me know if you have problems, Paolo > > Please do not hesitate to contact me if you need additional information. > Thank you. > > Regards, > > Nikolaos Abatzis > New River Systems Corporation > 1890 Preston White Drive, Suite 240 > Reston, VA 20191 Email has been scanned for viruses by Altman Technologies' email management service - www.altman.co.uk/emailsystems Glasgow Caledonian University is a registered Scottish charity, number SC021474 Winner: Times Higher Education’s Widening Participation Initiative of the Year 2009 and Herald Society’s Education Initiative of the Year 2009. http://www.gcu.ac.uk/newsevents/news/bycategory/theuniversity/1/name,6219,en.html Winner: Times Higher Education’s Outstanding Support for Early Career Researchers of the Year 2010, GCU as a lead with Universities Scotland partners. http://www.gcu.ac.uk/newsevents/news/bycategory/theuniversity/1/name,15691,en.html
