[redland-dev] Redland Rasqal RDF query demo

[Dave Beckett]

On Wed, 10 Nov 2004 18:38:51 +0000
Richard Newman <r.newman at reading.ac.uk> wrote:

> Very nice indeed! Almost certainly an error on my part, but the  
> following gives me "undef" for the two optionals.
> 

> http://librdf.org/query?uri=http%3A%2F%2Fwww.holygoat.co.uk%2Ffoaf.rdf&language=sparql&query=PREFIX+foaf%3A+%3Chttp%3A%2F%2Fxmlns.com%2Ffoaf%2F0.1%2F%3E%0D%0ASELECT+*%0D%0AWHERE%0D%0A++%28%3Fx+rdf%3Atype+foaf%3APerson%29%0D%0A++%5B%28%3Fx+foaf%3Aname+%3Fname%29%5D%0D%0A++%5B%28%3Fx+foaf%3Ambox+%3Fmbox%29%5D

(edited)

> Any thoughts?

Optionals aren't supported yet:

  [[Rasqal provides initial support for the W3C SPARQL Query Language
  being developed by the W3C RDF Data Access Working Group, as
  defined in SPARQL Query Language for RDF, W3C Working Draft, 12
  October 2004. It currently implements only the functionality in
  common with RDQL. For further information on the state, see the
  Rasqal todo / bugs list.
  ]] http://librdf.org/rasqal/

pointing to http://librdf.org/rasqal/TODO.html#sparql for the detail.

It's a feature I'd currently prioritise earlier than the others.

Dave