Not in general, no, although some specific DatasetGraph implementations may. 
There is some API support for reification:

https://jena.apache.org/documentation/notes/reification.html

Does that meet your use case?

ajs6f

> On Sep 18, 2018, at 3:37 PM, thomas lörtsch <[email protected]> wrote:
> 
> Hi,
> 
> a questions (and my apologies upfront that I don’t take the time to dive into 
> the code myself, but it would take me a lot of time):
> 
> Does Jena happen to add an internal ID to each quad (statement+graphName)?
> 
> Some databases do so for internal administrative purposes (I believe) and so 
> I thought it might be worth to ask.
> If Jena does provide such IDs I would like to use them as reification IDs and 
> my next question would be about how hard it is to access them.
> 
> Thanks,
> Thomas

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