In SBML controlled annotations, we use several elements coming from the Dublin Core Metadata Initiative. To specify that those elements are coming from DCMI and not SBML, we use the namespaces
It turns out that all the elements in the first namespace have now been mirrored in the second in order to simplify migration. See:
So we do not need to declare the first one anymore. We should deprecate its use in L3V2. That will reduce the size of the files, and create less confusion. Note that the use of the elements themselves does not change. Only the namespace declaration. And we were forced to declare both previsously anyway.