So, just to make certain:

o  There is a Bitstream Format Registry, which is initially populated
   at setup time from bitstream-formats.xml and modified later through
   one of the UIs.

o  There is a Metadata Schema Registry, which is populated whenever
   a schema is installed.  There is no separate file to be loaded; the
   information is supplied with each schema.

o  The "Dublin Core Metadata Registry" is a single schema definition,
   loaded from dublin-core-types.xml.  Loading it also adds DC to the
   Metadata Schema Registry.  This serves as an example of the
   previous point.

Correct?

We ought to call the "Dublin Core Metadata Registry" something else,
IMHO.  My understanding is that DC is DC and shouldn't be altered by
others; that the type definitions supplied with DSpace are (nearly) a
"profile" defining what parts of DC are core to DSpace; and that
anyone who wants other types should use or (if necessary) create an
additional schema.  I'm not an expert on such matters and I hope to
see comments from those who are, but if this area of the documentation
is being cleaned up right now then it is an excellent time to nail
down what we mean and what we recommend.

(I recall some comment that we are abusing one of the DC types.
Someday we ought to correct that, but for now at least it should be
well documented that whatever type that is does not mean in DSpace
what you might think it means from studying DC.)

-- 
Mark H. Wood, Lead System Programmer   [email protected]
Friends don't let friends publish revisable-form documents.

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