I'm in pretty much the same boat as you right now. Just learning about it. Sounded like it might be along the lines of what you were looking for.
For your case, do you at least know the possible properties that might be used, but just don't know which of those will be used in any specific case? Or do you mean you don't even know which possible properties might be used? If the former, you can make a transitive superproperty of all the possible intermediate properties and then query something like: ?x MyOnt:transSuper+/foaf:name ?name And I think that would find ANY path that uses your possible properties that ends in foaf:name. If you don't know possible props, maybe something like: ?x ?prop+/foaf:name ?name Might work. Again, these are just ideas, not sure if they'll work or not as I haven't had a chance to work with property paths. Also, unless you are talking about starting from a specific instance of ?x, these may take a LONG time to execute. Oh, and if you want a list of the traversed properties to there's a way to get that I think too, but would have to think about it a bit. Jeff -----Original Message----- From: donundeen [mailto:[email protected]] Sent: Friday, December 12, 2008 3:41 PM To: TopBraid Composer Users Subject: [tbc-users] Re: RDF Path discovery yeah, I was just checking that out. Very cool. I don't see in the documentation, though, how I could express arbitrary properties between two nodes. I see in the examples how to say "Find a path from ?x consisting of a bunch of foaf:knows, followed by foaf:name: ?x foaf:knows+/foaf:name ?name . But in my case, i don't know what properties may be in between ?x and ? name; that's one of the things I want to find out. Do you know if this is possible in the current property path syntax? I'd like to say something like (stealing from regex): ?x .+/foaf:name ?name . Or (stealing from xpath) ?x //foaf:name ?name . meaning "find ANY path that ends in foaf:name " what do you think? On Dec 12, 3:42 pm, "Schmitz, Jeffrey A" <[email protected]> wrote: > Have you looked at the new jena property path stuff? Not sure if this > is in the latest TBC, but if not it should be coming soon. > > http://jena.sourceforge.net/ARQ/property_paths.html > > Jeff > > -----Original Message----- > From: donundeen [mailto:[email protected]] > Sent: Friday, December 12, 2008 2:29 PM > To: TopBraid Composer Users > Subject: [tbc-users] RDF Path discovery > > Hi guys. > What capabilities does TopBraid have in terms of finding paths between > nodes. > I know that in ensemble, you can put two nodes on the graph view, and > then find the shortest path between those two nodes. > > That's great, but I'd like to take that idea a bit farther. I'm > guessing that underneath the above ensemble feature, there's a library > for doing this kind of path discovery. > > What I'd like to do is ask questions like "show me all instances of > 'location' (or it's subclasses) that are connected to this resource X > by any number of hops, but exclude paths that use properties a, b, and c" > > Experimentally, there's an extension to SPARQL called CPSPARQL, > described here:http://exmo.inrialpes.fr/software/psparql/, which is > pretty cool, though is super-beta, doesn't work on large datasets, etc > etc. But it shows what I'm driving at. > > So, if not in TopBraid, have any of you see good libraries for doing > this kind of work? > > thanks! > > don --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "TopBraid Composer Users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/topbraid-composer-users?hl=en -~----------~----~----~----~------~----~------~--~---
