I think R2RML and GRDDL could be of interest to you:
https://www.w3.org/TR/r2rml/
https://www.w3.org/TR/grddl/

On Wed, Sep 7, 2016 at 8:00 PM, ☼ R Nair (रविशंकर नायर)
<ravishankar.n...@gmail.com> wrote:
> Agree, the question is whether an RDF can be created out of the data from
> multiple data sources and use it for semantic correlation. That would turn
> the world round. In my organization,  there are at least a PB of data lying
> in disparate sources, untapped because , they are legacy and none knows the
> relationships until explored manually. If Jean is not, any suggestions to
> manage this? Thanks
>
> Best, Ravion
>
> On Sep 7, 2016 1:55 PM, "A. Soroka" <aj...@virginia.edu> wrote:
>
> Jena is an RDF framework-- it's not really designed to integrate SQL
> databases. Are you sure you are using the right product? Does your use case
> involve a good deal of RDF processing?
>
> ---
> A. Soroka
> The University of Virginia Library
>
>> On Sep 7, 2016, at 1:43 PM, ☼ R Nair (रविशंकर नायर) <
> ravishankar.n...@gmail.com> wrote:
>>
>> All,
>>
>> I am new to Jena. I would like to query two databases, mysql and Oracle.
>> Assume that there are similar columns in both. For example MYSQL contains
> a
>> table EMP with ENAME column. Oracle contains, say, DEPT table with
>> EMPLOYEENAME column. What are the steps if I want Jena to find out ENAME
> of
>> MYSQL is same as EMPLOYEENAME column of Oracle, ( and so can be joined).
> Is
>> this possible, at least to get an output saying both columns are similar?
>> If so, how, thanks and appreciate your help.
>>
>> Best, Ravion

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