You can export anything created in S3DB into RDF. A few of the RDF flavours are supported: rdf/xml; rdf/turtle; rdf/n3 and rdf/json (not yet a recommendation but still useful...).
Here is how you do it using the interface:
Now on the menu, you will probably want to "export all"
The process of importing is also very easy:
Make sure you upload it to A DIFFERENT DEPLOYMENT, otherwise it wil create a big identifier mess :(