Yeh, I understand that I can hide stuff using templates, but uniqueness is a
key here and the funny part that underlying infrastructure actually support
it easily - just select from different column.
I need this badly - I don't want to add data to the system just to support a
query althought I might make sense to just have [[Category:Conference
Series]] in all conference series template or something.
Sergey
On 5/21/07, S Page <[EMAIL PROTECTED]> wrote:
Sergey Chernyshev wrote:
> In my techpresentations.org <http://techpresentations.org> wiki, I have
> conference page like "OSCON 2006" that have [[Series::OSCON]] relations
> to the conference series pages.
>
> Is there any way for me to select all objects of "Series" relation, e.g.
> "OSCON" without selecting subjects of those relations. I also need to
> have them unique (similar to DISTINCT in SQL).
>
> This can be easily done using regular RDF tools like Redland for
example.
>
> I can't find solution myself - any help will be appreciated!
Subqueries provide a restricted list of objects to an inline query, e.g.
[[Series::*]][[Series::+]]<q>[[Blog:=+]]</q>
will only show the pages with a Series relation whose object has a Blog.
BUT, I can't figure out how to get inline queries to just show the
objects returned by the subquery.
You can fake it by using templates in SMW 0.7 to hide the subjects. I
made http://www.techpresentations.org/Test
But you don't get uniqueness; you're still asking for "All pages that
are the subject of a Series relation, and for each of these the object
of its Series relation".
However, Yaron Koren recently wrote in "Re: [SMW-devel] Reflexive
results?":
> Well, my mistake - I tried it out, and it appears "inverse queries",
> i.e. queries that return the object of triples, given the subject,
> work. And it looks like the functionality has been in SMW for a
> while... for some reason, it's not mentioned in the help page
> (http://ontoworld.org/wiki/Help:Inline_queries), and I couldn't see
> documentation anywhere else either. Is this a secret or unsupported
> feature? In any case, good to know.
But he didn't say how he got it to work!
Wei Dai posted a patch back on 2006-12-19, "[SMW-devel] patch: inline
query for inverse relations and relation wildcard", I don't think anyone
tried it.
--
=S Page
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