Create interface RDFDataUnitHelper, move some methods from RDFDataRepository.
Update interface RDFDataRepository - using extendeng of RDFDataUnitHelper.
Remove class RDFDataUnit.
Rename interface RDFDataRepository to RDFDataUnit.
Update refactoring RDFDataUnit in all 5 implemented DPUs.
Create RDFDataUnitFactory class with factory methods.
Using RDFDataUnitFactory for creating instance.
Refactor RDFDataRepository to RDFDataUnit when is it used.
Remove factory methods from Local/VirtuosoRDFRepo - is used RDFDataUnitFactory.