Introducing a common namespace is another approach for bridging
across different addressing realms. Here, identifiers used at a
particular level belong to a common namespace shared by all networks.
This method inherently establishes a uniform namespace
for a new level of identities to which the local locators can be
mapped and thus does not require translation. In the extreme, the
common namespace is globally shared, for example, the Internet’s
global IPv4 address space. Note that a common namespace corresponds
to the internetworking principle.