Re: Reviving Semantic Relationships in Beagle

["Enrico Minack" <minack L3S de>]

Hi David, hi Kevin,

David Peterson wrote:
> Are you aware of the Aperture project [1]? They have developed a crawler 
> and
> RDF extractor that crawls the filesystem as well as the web. Very
> comprehensive system. I believe this project could utilise aspects of the
> Aperture system. Beagle already does the crawling so you could use the
> getRDFContainer method (which just takes a URI) and spits out an RDF 
> model.
>
> You can then use this RDF model in whatever way you would want inside of
> Beagle.
I think the current step of semantifying Begale (adding RDF capabilities) is 
yet at a simpler level. The idea is first to only provide a basic RDF query 
interface on top of the existing infrastructure and Lucene indices. Just to 
open the stored metadata to RDF clients, just to see how this performs and 
what it enables. As far as I can see, this issue is feasable.

Kevin Kubasik wrote:
> > But, in my opinion, the best improvement
> > would be to arrange beagle metadata in a OWL ontology.
> I'm sorry, most of us are pretty new to the whole RDF terminology
> thing, I've heard of ontology, but OWL?
Well, in simple words, on ontology can be defined using RDFS (RDF Scheme) or 
OWL. OWL is more powerful, but RDFS is sufficient for current RDF activities 
regarding Beagle. The Beagle ontology basically should give URIs to all 
kinds of metadata it knows about (this are the field names of the Lucene 
Documents).

> > In this way, metadata could populate a Knowledge Base of system.
> > Clearly, this involve a preexisting OWL rules.
> > The challenge, for me, is to build a GUI that easily allow Description
> > Logic search.
> Building on before, I'm a little lost by what your getting at here,
> could you explain in a little more detail, or give an example? Thanks!
I think reasoning and DL is two or three levels above the current first 
step.

Cheers,
Enrico