________________________________
From: Andy Seaborne <[email protected]>
To: Vishal Sinha <[email protected]>
Cc: "[email protected]" <[email protected]>
Sent: Monday, January 28, 2013 5:16 PM
Subject: Re: Combined query over different dataset and interlinking btween
dataset
On 28/01/13 06:24, Vishal Sinha wrote:
>
>
> ------------------------------------------------------------------------
> *From:* Andy Seaborne <[email protected]>
> *To:* [email protected]
> *Sent:* Monday, January 28, 2013 3:25 AM
> *Subject:* Re: Combined query over different dataset and interlinking
> btween dataset
>
> On 25/01/13 06:43, ankur padia wrote:
> > hello vishal,
> >
> > Based on my experience, list of statement would be help full for
> > question 1 and for question 2 some if condition would be required to be
> > specified. And I think "Filter" class would be helpful but as I haven't
> > came across any tutorial on "Filter". As a result it would be like
> hit and
> > try.
> >
> > Regards,
> > Ankur Padia
> >
> >
> > On Fri, Jan 25, 2013 at 11:00 AM, Vishal Sinha
> <[email protected] <mailto:[email protected]>>wrote:
> >
> >> Hi,
> >>
> >> I have created two Datasets using Jena.
> >> Each Datasets having two or three models.
> >>
> >> Lets say triples in Dataset1 are:
> >> x1 y1 z1.
> >> x2 y2 z2.
> >> x3 y3 z3.
> >> x4 y4 z4.
> >> x5 y5 z5.
> >> x6 y6 z6.
> >>
> >> Lets say triples in Dataset2 are:
> >> x11 y11 z11.
> >> x21 y22 z22.
> >> x33 y33 z33.
> >> x44 y44 z44.
> >> x55 y55 z55.
> >> x66 y66 z66.
> >>
> >> My questions:
> >> - How can I make combined query on these two data-sets, or lets say
> >> multiple datasets using Jena ?
> >> - How can I state that 'y22' in Dataset2 is actually same as 'y5' in
> >> Dataset1 ? Where should I keep this information?
>
Andy wrote:
> Do the datasets have named graphs in common? If not, then making a
> single dataset with all the data in is one possibility.
>
Vishal wrote:
> Both the datasets has default graph models, not any named graph.
Then you can put both in one dataset, each as a named graph. You can
query a specific graph with GRAPH or the combined grapgs using
unionDefaultGraph.
++++++ Thanks, it works now.
Otherwise, you can create a union graph and put each graph in it. Less
efficient but it depends if you have a lot of data or not (=> TDB
database and several million triples).
Andy
>
> Andy
>
> >>
> >> Thanks,
> >>
> >> Vishal
> >
>
>
>
