Collection launched: 15 May 2017
Persistent identifiers (PID) for scholarly resources have been in use now for more than 20 years. Since the initial launch of Handle.net, we have seen a proliferation of PIDs addressing many use cases. Some PID systems have become established parts of the science information infrastructure. In other areas we see work in progress, and new use cases being proposed. This special collection of papers discusses the architecture of PID systems, their adoption and application, and new use cases.