How to rename a namedModel?

Hi all,
I'd like to hear from you the "optimal/suggested" way to rename a named
model into TDB dataset on file system.

Does adding the same Model twice in two different named models, duplicate
the triples or it does some "symlink"?

I've to load a very huge ontology (TDB size is 5.5GB after its load) from
file into a named model, in my TDB dataset on file system, which will be
named as this ontology owl:versionInfo/versionIRI (if present).
At the moment, to do that I load the ontology into a temporary TDB dataset
on file system, then I read owl:version* from that model and I put the
ontology in a named model in my main dataset.
I don't put it directly into my main dataset just to avoid to lock it
during the owl:version* check.

Thanks.
Cheers