On 28/01/13 06:24, Vishal Sinha wrote:
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*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.
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
>
