[Mulgara-dev] Mulgara and Jena

Paul Gearon gearon at ieee.org
Wed Aug 8 14:43:06 UTC 2007


Hi Norman,

I'd love to say that we have a SPARQL endpoint, but we don't.  We're
still a few weeks away from it (I'll be spending this week on it).

As for Jena, we made a decision some time ago to deprecate this
interface.  Unfortunately, many people started using a number of Jena
interfaces beyond the "public" ones that HP wanted them to use.
Consequently, we had to support numerous interfaces and classes which
were tied to the HP design - and this was not scalable.  Consequently
the Jena interfaces were bad news for us, and were seriously hurting
people's perception of what we could do.

I'm not SURE if we have since removed these interfaces (have to check
on that), but we've made enough modifications that I can't imagine
them working properly anymore.

Since you need SPARQL, I'd recommend another store for the moment.
Revisit us in a month or so and we should have it.  Ideally, you'll be
able to swap between stores easily if we're all supporting the same
standard!  :-)

Paul

On 8/7/07, Norman Gray <norman at astro.gla.ac.uk> wrote:
>
> Greetings.
>
> I'm looking at Mulgara as a queryiable triple store, to manage of the
> order of 500-1000k triples.
>
> A SPARQL endpoint would be ideal for me, but I thought I'd play with
> the Jena+Mulgara integration of [1], to see what I could do.  I have
> a couple of questions which I couldn't resolve from the documentation
> or wiki, which I hope someone here might be able to help with.
>
> That page describes integrating Mulgara and Jena.  Does this mean
> that I would be able to use Mulgara as a backing store for Jena's
> query support?  This _sounds_ like a way of getting a SPARQL endpoint
> in front of a Mulgara store -- what am I misunderstanding?
>
> In the archive of the mulgara-dev list, there's a remark[2] that "Jena
> +Mulgara is *not* recommended", and doesn't seem to chime with the
> fairly prominent discussion of Jena integration.  That's a little
> disappointing: can anyone expand on this?
>
> More a suggestion than a question: the page [1] could probably
> benefit from a pointer to the Mulgara javadocs.  Since the examples
> there don't include full package names, it's not always clear whether
> the various classes are Jena or Mulgara ones.
>
> Thanks for any pointers.
>
> Norman
>
>
> [1] http://docs.mulgara.org/integration/jena.html
> [2] http://mulgara.org/pipermail/mulgara-dev/2007-April/000460.html
>
> --
> ------------------------------------------------------------
> Norman Gray  :  http://nxg.me.uk
> eurovotech.org  :  University of Leicester, UK
>
>
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