Jena text Search

[Kamalraj Jairam <kj...@semanticsoftware.com.au>]

Hello All,

I have number of data properties in TDB dataset with ranging Uris

I want to create a lucene index on these data properties so that any partial text search is fast.

I read the document on Jena Website, but i have some questions on what needs to be done

This is what the text says

// Example of building a text dataset with code.

    // Example is in-memory.
    // Base dataset
    Dataset ds1 = DatasetFactory.createMem() ;

    EntityDefinition entDef = new EntityDefinition("uri", "text", RDFS.label) ;

    // Lucene, in memory.
    Directory dir =  new RAMDirectory();

    // Join together into a dataset
    Dataset ds = TextDatasetFactory.createLucene(ds1, dir, entDef) ;

What should go in the Uri - > is it the base Uri?

What should go in the “Text” ? can this be left blank?

Thanks
Kamalraj

Re: Jena text Search

[Andy Seaborne <an...@apache.org>]

On 19/01/15 22:33, Kamalraj Jairam wrote:
> Hello All,
>
> I have number of data properties in TDB dataset with ranging Uris
>
> I want to create a lucene index on these data properties so that any partial text search is fast.
>
> I read the document on Jena Website, but i have some questions on what needs to be done
>
> This is what the text says
>
> // Example of building a text dataset with code.
>
>      // Example is in-memory.
>      // Base dataset
>      Dataset ds1 = DatasetFactory.createMem() ;
>
>      EntityDefinition entDef = new EntityDefinition("uri", "text", RDFS.label) ;
>
>      // Lucene, in memory.
>      Directory dir =  new RAMDirectory();
>
>      // Join together into a dataset
>      Dataset ds = TextDatasetFactory.createLucene(ds1, dir, entDef) ;
>
> What should go in the Uri - > is it the base Uri?
>
> What should go in the “Text” ? can this be left blank?

The "uri" is the target (result) of the search.

That EntityDefinition says to use the Lucene field "text" for the 
indexed strings of rdf:label statements.

It will look up "text" and return "uri".

	Andy

>
> Thanks
> Kamalraj
>
>