Is the plan to support transitivity in a generalized way? Could someone assert that ancestry is transitive in such a way that a query asking "is Aaron Burr an ancestor of Jody Foster" would cause metaweb to walk up 'parent' links and give an answer?
<br><br><br><div><span class="gmail_quote">On 10/2/07, <b class="gmail_sendername">Robert Cook</b> <<a href="mailto:robert@metaweb.com">robert@metaweb.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Just so you know, it's one of our goals to support transitive closure in particular on geographic containment and do it in a performant way. That is, your French University example below should work with little penalty in execution time. I don't currently have an ETA, but it's something we're serious about.
<br><br>R<br><br>----- Original Message -----<br>From: "Kavitha Srinivas" <<a href="mailto:ksrinivs@gmail.com">ksrinivs@gmail.com</a>><br>To: "Shawn Simister" <<a href="mailto:narphorium@gmail.com">
narphorium@gmail.com</a>><br>Cc: <a href="mailto:developers@freebase.com">developers@freebase.com</a><br>Sent: Tuesday, October 2, 2007 7:21:02 PM (GMT-0800) America/Los_Angeles<br>Subject: Re: [Developers] Reasoner?<br>
<br>Shawn has a good point. If you want to describe role hierarchies, or<br>transitivity (e.g., locatedIn is transitive), then you can use OWL<br>and use OWL reasoners to do this.<br>Kavitha<br><br>On Oct 2, 2007, at 6:08 PM, Shawn Simister wrote:
<br><br>> Once the Freebase data is available as RDF it will be possible to<br>> reason<br>> about it using any of the existing RDF reasoners out there. I'm<br>> working<br>> on making this happen but I only have a little bit of free time
<br>> right now.<br>><br>> Shawn<br>><br>> Christoph Pingel wrote:<br>>> Hello,<br>>><br>>> I'm wondering if there is any artificial reasoner involved in<br>>> freebase? My impression from looking into MQL is that queries only
<br>>> result in the explicit structures, not implicit ones.<br>>><br>>> For example, can I ask for universities in France and get *all*<br>>> French universities even if "contained by Lyon" or "contained by
<br>>> Toulouse" are the only location values that are there?<br>>><br>>> Another case would be the research for people with a certain<br>>> expertise that can be expressed in rules like<br>>> "person knows about topic if
<br>>> person wrote book about topic<br>>> or person wrote article about topic<br>>> or person organized workshop about topic<br>>> or person curated exposition about topic
<br>>> ".<br>>><br>>> My second question is somewhat related. Perhaps it would make sense<br>>> to have specialisation hierarchies (or inheritance chains) for<br>>> relationships as well, not just for types.
<br>>><br>>> Looking at movies, for example, all the actors, the director etc. are<br>>> all involved with a certain movie. From time to time, there are cases<br>>> when it would be convenient to just ask for »people involved«...
<br>>> Hm, I'm not sure. Perhaps what I'm asking for is to have inheritance<br>>> between compound value types...<br>>><br>>> best regards,<br>>> Christoph<br>>> _______________________________________________
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