Clarification on URI Data Type

[ValentinFutterer]

E.g. in distribution, the access_url and download_url have the data type URI. But they have URL in their name and they are obviously supposed to be links that lead to a webpage/download. In my opinion, URI is the wrong data type here, since URIs could either be a URl or a URN. URNs are just a unique name, with no way to access the resource behind the name. As opposed to URLs, which do offer a way to access the resource described. So in short, every URL is a URI, but not all URIs are URLs.

This ambiguity also affects other parts of the schema. As a software developer, I would like clarification on this issue, to validate inputs correctly.