LARQ - adding free text searches to SPARQL
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LARQ is a combination of ARQ and Lucene. It gives ARQ the ability to perform 
free text searches. Lucene indexes are additional information for accessing 
the RDF graph, not storage for the graph itself.

See also:

 - http://incubator.apache.org/jena/documentation/larq/
 - https://svn.apache.org/repos/asf/incubator/jena/Jena2/LARQ/trunk/
 - http://incubator.apache.org/jena/documentation/query/extension.html#propertyFunctions