The EZID provider depends on the registrar to generate and return the
identifier, so it cannot supply one in the request. But the DataCite
XML schema requires an "identifier" element. A new transform is
offered, which generates an empty "identifier" element, satisfying
EZID.
DS-2119. EZID IdentifierProvider Metadata Mapping.
In the interest of time, merging this despite a problem with the transform, for which I already have a solution. A separate PR will provide that solution.
Improved through (I hope) a better understanding of how to create
Items. However this module is still not quite right. For now,
commenting out the guts of it.
