Error during command authentication.

Error - unable to initiate communication with LISTSERV (errno=111). The server is probably not started.

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While the description for bf:Identifier (
http://id.loc.gov/ontologies/bibframe.html#c_Identifier) is "Token or name
that is associated with a resource, such as a URI or an ISBN", its
subclasses include bf:Isbn but not bf:Uri[1].

For now I've interpreted this as "just use bf:Identifier if you have a
URI," but if that interpretation is correct, it might make sense to clarify
the description.

Example:

@prefix bf: <http://id.loc.gov/ontologies/bibframe/> .

<http://example.org/2335409#Work> a bf:Text, bf:Work ;
   bf:identifiedBy <http://worldcat.org/entity/work/id/638612>.

<http://worldcat.org/entity/work/id/638612> a bf:Identifier .