- From: Richard Newman <r.newman@reading.ac.uk>
- Date: Sat, 11 Nov 2006 11:00:58 -0800
- To: "Adrian Walker" <adriandwalker@gmail.com>
- Cc: chris@bizer.de, SW-forum list <semantic-web@w3.org>
> However, I believe that sparql lacks this kind of negation.
Can you not use this idiom:
optional { ?x :p ?v } . filter (!bound(?v))
?
> So I'm wondering please whether it is possible to write in sparql
> queries equivalent to
>
> Q1 show me the name of a person who is missing from the list
> of authors of a publication from fu-berlin
>
> Q2 show me the names of people who are on the list of authors
> of every publication from fu-berlin
>
> Thanks for your thoughts about this, in particular, actual sparql
> queries.
>
> --
> Adrian
>
I'll allow Chris to provide some real queries, as I'm unfamiliar with
the details of the ontology.
-R
Received on Saturday, 11 November 2006 19:01:24 UTC