Yes I understand this, my problem is that I don't understand why/when would I 
want to use this and when standard STR functions are OK instead.


> The fullext index via Lucene is only used if you use the corresponding
> special predicate (which is non-standard SPARQL syntax) in your query:
> 
> text:query
> 
> e.g. in a query like (taken form the documentation):
> 
> PREFIX text: <http://jena.apache.org/text#>
> PREFIX rdfs: 
> <http://www.w3.org/2000/01/rdf-schema#[http://www.w3.org/2000/01/rdf-schema#]>
> 
> SELECT ?s
> { ?s text:query (rdfs:label 'word' 10) ;
> rdfs:label ?label
> }

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