Re: GUADEC redux and roadmap

["Enrico Minack" <minack l3s de>]

>        * Metadata store - Jon and I talked about this at GUADEC and
>        after thinking about it for a few days, I think we have an
>        approach that will work.  Whether or not it scales is yet to be
>        seen, however.  Right now we are storing all of our metadata in
>        Lucene.  This works fine for largely immutable text-based
>        values, but doesn't work well when you want to deal with
>        external metadata (think Nautilus emblems, Leaftag or F-Spot
>        tags, etc.).  The plan currently is to move storing of all
>        metadata into a database and use Lucene only for its text
>        indexing capabilities.  This will allow us to (a) adapt better
>        to changes in external metadata stores, (b) store metadata
>        ourselves on behalf of applications, and (c) make keyword
>        searches simpler.  I started prototyping something on my laptop
>        on the plane; I'll need to play with it a little bit more if I
>        can get my laptop going again.

Joe, it would be great if these metadata would be stored as RDF. Both
the metadata as well as their schemas can be represented as RDF, which
then makes the RDF store the perfect exchange mechanism between all
applications generating these metadata, and applications using them. We
use that approach in our NEPOMUK project, and it works very well to
integrate contributions from different project partners.

Storing the metadata in RDF also enables path-like queries where you 
traverse
along the graph which connects different entities (Emails, Documents, 
Persons, ...)
via their metadata (received by, ...).


Enrico Minack