-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 If you put valid RDF in a Fedora object's RELS-EXT and the subject of each triple is the Fedora object whose RELS-EXT it is, the triples should indeed get indexed in the RI and should be available for querying, whether the objects of the triples are literals or URIs (or particularly, Fedora URIs).
- --- A. Soroka Software & Systems Engineering :: Online Library Environment the University of Virginia Library On Mar 12, 2012, at 11:43 AM, Bengt Neiss wrote: > Hello all, > > Would like to make a follow up question on this issue.. > > If I create these "literals" in the RELS-EXT datastream and would like to use > them as constraints in an iTQL query - is that possible? > Will they be indexed by Mulgara (in Fedora-Commons)? > > > Something like: > select $child $parent $status > from <#ri> > where $child <fedora-rels-ext:isPartOf> $parent > and $child <kb:status> $status > > If not - is there a way to configure the Mulgara instance in Fedora to make > these kind of iTQL constraints possible? > > //Bengt > > > > --------------------------------------------------------- > Bengt Neiss > Kungl. Biblioteket / National Library of Sweden > Phone: +46 (0)10 709 35 41 > >> -----Ursprungligt meddelande----- >> Från: Stephen Bayliss [mailto:stephen.bayl...@acuityunlimited.net] >> Skickat: den 4 januari 2012 11:07 >> Till: 'Support and info exchange list for Fedora users.' >> Ämne: Re: [fcrepo-user] Properties within RELS-EXT? >> >> And to add it's also valid to have URIs as objects of the triples in >> addition to >> literals. >> >> I'd recommend that you create the properties in your own namespace rather >> than using properties in one of the Fedora namespaces. >> >> Steve >> >>> -----Original Message----- >>> From: aj...@virginia.edu [mailto:aj...@virginia.edu] >>> Sent: 03 January 2012 17:07 >>> To: Support and info exchange list for Fedora users. >>> Subject: Re: [fcrepo-user] Properties within RELS-EXT? >>> >>> >>> If by "properties" you simply mean RDF triples with literal objects, >>> it is certainly fine to do that in Fedora 3.x. >>> >>> Keep in mind that in your example below, you are making "kb:timestamp" >>> and "kb:status" assertions about the _object_ "info:fedora/kb:33001", >>> _not_ about the rel:isConstituentOf _relation_ between >>> "info:fedora/kb:33001" and "info:fedora/kb:33000". Making assertions >>> about a relationship would require some affordance roughly equivalent >>> in expressive power to RDF reification, which is not a base capability >>> of the Fedora RI at this time. >>> >>> --- >>> A. Soroka >>> Online Library Environment >>> the University of Virginia Library >>> >>> On Jan 3, 2012, at 4:24 AM, Bengt Neiss wrote: >>> >>>> Hello >>>> >>>> I just want to check if it is allowed or "not recommended" >>> to create >>>> "properties" within the RELS-EXT datastream? We have done something >>>> similar to this in a Fedora 2.x repository but will now >>> start to use >>>> Fedora 3.5 (probably). The idea is to be able to create >>> relations that are valid within a specific timeframe. >>>> >>>> Something like the following: >>>> >>>> <rdf:RDF> >>>> <rdf:Description rdf:about="info:fedora/kb:33001"> >>>> <rel:isConstituentOf rdf:resource="info:fedora/kb:33000"/> >>>> <kb:timestamp>123456789</kb:timestamp> >>>> <kb:status>active</kb:status> >>>> </rdf:Description> >>>> </rdf:RDF> >>>> >>>> >>>> >>>> >>>> >>>> >>>> Happy New Year everyone! >>>> >>>> //Bengt >>>> >>>> >>>> --------------------------------------------------------- >>>> Bengt Neiss >>>> Kungl. Biblioteket / National Library of Sweden >>>> Phone: +46 (0)10 709 35 41 >>>> >>>> >>> ---------------------------------------------------------------------- >>>> -------- >>>> Write once. Port to many. >>>> Get the SDK and tools to simplify cross-platform app >>> development. Create >>>> new or port existing apps to sell to consumers worldwide. >>> Explore the >>>> Intel AppUpSM program developer >>> opportunity.appdeveloper.intel.com/join >>>> >>> http://p.sf.net/sfu/intel-appdev______________________________ >> _________________ >>> Fedora-commons-users mailing list >>> Fedora-commons-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/fedora-commons-users >> >> >> ---------------------------------------------------------------------------- >> -- >> Write once. Port to many. >> Get the SDK and tools to simplify cross-platform app development. Create >> new or port existing apps to sell to consumers worldwide. 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