Re: [Semediawiki-user] Querying for objects, not subjects.

[Sergey C. <sem...@an...>]

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 <ski...@ea...> 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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