Re reference to "globally-unique identifier" below: shouldn't it also be
persistent/permanent? For example, a URL is a URI but it's not permanent.
Should we specifically refer to URNs or PURLs instead? Or, to be non-Web
specific, DOIs?
Cliff Morgan
Publishing Technologies Director
John Wiley & Sons Ltd
Chichester PO19 1UD
UK
I. Relation Semantics:
The Relation element specifies the relationship between the present
resource and a target resource, and can be thought of as two entities
connected by an arc, the arc being a named relationship.
The present resource is unambiguously identifiable as the resource with
which the metadata is associated (identified in the Identifier element).
The target resource should be unambiguously defined by a globally-unique
identifier (one of any of several varieties in common usage: ISBN, URI,
whatever).
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