Basically a big problem that we struggle with is that the level above URIs was never implemented. There was supposed to be one more level for an identifier that

Basically a big problem that we struggle with is that the level above URIs was never implemented. There was supposed to be one more level for an identifier that would always point to a resource no matter how the underlying structure of it changed. nearly 25 years later and we just now have the infrastructure in place to actually try to accomplish this using DOIs and the like.