Does it work when Subject is defined as *?
Like if you have a relation on Sergey's page defined as:
Sergey knows [[Has friend::John Doe]] and [[Has friend::Jane Doe]] from
high school and [[Has friend::Peter Smith]] from college.
and on Yaron's page defined as:
Yaron knows [[Has friend::John Doe]] from college and [[Has
friend::Peter Smith]] from work.
Regular query
[[Has friend::*]]
will return:
Sergey John Doe
Jane Doe
Peter Smith
Yaron John Doe
Peter Smith
But what if I want to get result of "Is a friend of" (opposite to "Has
friend") and expect results like this:
John Doe Sergey
Yaron
Jane Doe Sergey
Peter Smith Yaron
Sergey
What kind of query should I run? [[*::Has friend]] doesn't seem to help ;(
On 5/18/07, Yaron Koren <[EMAIL PROTECTED]> wrote:
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.
-Yaron
On 5/17/07, Yaron Koren <[EMAIL PROTECTED]> wrote:
> This question is a little confusing to think about (at least for me),
> because "friend of" is, in real life, always a bi-directional
> relationship. So let me substitute something that's more clearly
> one-directional for this example: how about "has been to the house
> of".
>
> Looking at it that way, I don't believe your first example will work.
> I don't think there's any way to determine whom a person "has been to
> the house of" - you can only find out who "has been to the house of" a
> certain person. I think what you're looking for is an inverse query,
> which isn't supported, though the issue has come up before on this
> mailing list.
>
> -Yaron
>
>
> On 5/17/07, Jim Wilson <[EMAIL PROTECTED]> wrote:
> > Hi SMW Devs,
> >
> > Quick question: is there a way to get a list of all articles that meet
a
> > reflexive criteria?
> >
> > For example, I've got a relation called "friend of", and I know how to
do
> > these types of queries:
> >
> > <ask>[[User:Whoever]][[friend of::*]]</ask> - This will return all
articles
> > that User:Whoever is a "friend of"
> >
> > <ask>[[friend of::User:Whoever]]</ask> - This will return all articles
that
> > are "friends of" User:Whoever
> >
> > Is there a way to get the intersection of these two sets? Meaning,
everyone
> > who is both "friend of" User:Whoever, and who User:Whoever says
they're
> > "friend of"?
> >
> > Thanks in advance for your help - I really appreciate it.
> >
> > And if the answer is "no, there's no pure SMW way to do that", that's
fine
> > too - I can find another solution. I just don't want to waste my time
> > looking for one if SMW can get the job done on its own.
> >
> > Thanks!
> >
> > -- Jim R. Wilson (jimbojw)
> >
> >
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