Urn is a subclass of Identifier, as are about 30 other classes which are identifier types. Urn is just another identifier type that might identify a resource, in the same manner as an ISBN might identify a resource.    A Urn is in fact a URI, but that’s irrelevant.  It is not an HTTP URI.   HTTP URIs, and only HTTP URIs, are used to identify resources that are subjects or objects of RDF statements.


On Jun 9, 2016, at 6:25 PM, Joseph Kiegel <[log in to unmask]> wrote:

The definition of the class bf:Urn should be Uniform Resource Name, rather than Uniform Resource Number.


The larger question is why BF uses URN rather than URI.