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
> > >
> > >
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