- From: Gregory Williams <greg@evilfunhouse.com>
- Date: Tue, 8 Jun 2010 11:51:34 -0400
- To: Birte Glimm <birte.glimm@comlab.ox.ac.uk>
- Cc: SPARQL Working Group WG <public-rdf-dawg@w3.org>
On Jun 8, 2010, at 11:45 AM, Birte Glimm wrote:
> Thus, a (mathematically) natural interpretation would be to return
> only subjects and objects because they are the elements of the
> relations (as also Andy suggested below). It still does what Greg
> wants I believe. E.g. lets say G contains:
> ex:a ex:mylabel "l1".
> ex:mylabel rdfs:subPropertyOf rdfs:label
>
> Greg's query is:
> SELECT ?label WHERE {
> ?p rdfs:subPropertyOf* rdfs:label .
> ?s ?p ?label .
> }
My issue with this example was specifically so that it would handle not only the case you show (with a subproperty of rdfs:label), but also ones where there is no schema information at all. If the data only contained:
<s> rdfs:label "foo" .
then I believe your approach wouldn't return any bindings for ?label, even though { ?label = "foo" } would be the intuitive result of the query, as far as I'm concerned.
.greg
Received on Tuesday, 8 June 2010 15:52:31 UTC