- From: Gregory Williams <greg@evilfunhouse.com>
- Date: Thu, 30 Sep 2010 14:27:30 -0400
- To: Andy Seaborne <andy.seaborne@epimorphics.com>
- Cc: SPARQL Working Group <public-rdf-dawg@w3.org>
On Sep 30, 2010, at 6:57 AM, Andy Seaborne wrote:
> Following a jena-dev question, I wondered what do implementations do with the following?
>
> # Duplicate select variable - SPARQL 1.0
> SELECT ?s ?s ?p ?o
> {
> ?s ?p ?o
> }
At the protocol level RDF::Query duplicates ?s, but at the API level the variable bindings only contain ?s once (being associative arrays). The protocol/interface code just accesses the projection list and loops over the variables, though, so it ends up being produced twice.
.greg
Received on Thursday, 30 September 2010 18:28:27 UTC