Re: [rdf4j-dev] Query bnode

[Håvard Ottestad <hmottestad@xxxxxxxxx>]

Hi Jeen,

That’s fairly viable. Thanks Jeen. 

And I also found out I can use the capabilities for traversing the parsed query to meet() at the VALUES expressions when using that and adding the blank nodes in there directly. 

Håvard

On 16 Feb 2019, at 00:34, Jeen Broekstra <jeen.broekstra@xxxxxxxxx> wrote:

We don't support this kind of thing directly in SPARQL. 

However, there is a workaround you can use, which is to add a binding to a BNode via the API instead:

    TupleQuery query = conn.prepareTupleQuery("select * where { ?a ?b ?c }");
    query.setBinding("a", bnode);

The usual caveats about the scope of bnode identifiers and over-reliance on them remaining stable apply :)

Jeen

On Sat, Feb 16, 2019 at 6:27 AM Håvard Ottestad <hmottestad@xxxxxxxxx> wrote:

Hi,

I’m wondering if there is a way of querying a bnode?

I’m used to the following working from working with Stardog:

select * where {<_:bnode1> ?b ?c}

Any way of doing something similar in rdf4j directly? I realised that the SHACL sail is fairly broken when working with bnodes because of its use of SPARQL.

Cheers,
Håvard
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