This is the ActiveRDF adapter to the Jena RDF library.

Features:

• supports memory, file and database stores; database stores can be configured both with datasources and raw connection parameters. Jena currently supports Oracle, MySQL, HSQLDB, PostgreSQL, MS SQL, and Derby.

• supports reasoners, including Pellet and the built-in Jena reasoners

• supports Lucene query support in ARQ (since LARQ doesn’t allow you to add statements and reindex only those statements, whenever we’ve add a statement to a triple store, we must rebuild the index at query time)

Requirements:

• JRuby is required to natively execute Jena

• the application can only use pure ruby gems

License: included LGPL license (version 2 or later).

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Installing and running JRuby:

Download the newest JRuby distribution from jruby.codehaus.org/

Unpack it somewhere, e.g. /usr/local/jruby

Then set your environement:

export JRUBY_HOME=/usr/local/jruby export JAVA_HOM=/path/to/java/home export PATH=$JRUBY_HOME/bin:$PATH

check if you now have the correct jruby commands in your path: which jruby -> /usr/local/jruby/bin/jruby which gem -> /usr/local/jruby/bin/gem

Now you can install rails and activerdf: gem install rails –include-dependencies –no-rdoc –no-ri gem install activerdf –include-dependencies –no-rdoc –no-ri gem install activerdf_jena –include-dependencies –no-rdoc –no-ri

For more information see wiki.activerdf.org/GettingStartedGuide