DCD: namespaces in element and attribute references

[Ron Bourret]

When referring to attributes and elements in another namespace, DCD uses a 
prefixed element or attribute name. The prefix identifies the namespace, which 
corresponds to the value of the Namespace element in some external DCD. For 
example:

<ElementDef Type="foo">
   <Group RDF:Order="Seq">
      <Element>bar</Element>      <!-- bar is defined in this DCD -->
      <Element>baz:blah</Element> <!-- blah is defined in a separate DCD -->
   </Group>
</ElementDef>

How is the prefix associated with a namespace? With an xmlns:xxx attribute? If 
so, are there any adverse consequences to doing this? (I can't think of any 
right off.)

-- Ron Bourret

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