"certain well-structured XML DTDs"

In the RDF spec, it describes the abbreviated syntax as allowing:

    documents obeying certain well-strctured XML DTDs to be directly
    interpreted as RDF models

It seems to me that the spec is referring to a specific XML format here --
does anyone know what it is? If not, what does this sentence mean? Wouldn't
it be true that a DTD could be written for the unabbreviated syntax also?

Thanks,

-- 
Aaron Swartz <me@aaronsw.com>|       The Info Network
  <http://www.aaronsw.com>   |     <http://theinfo.org>
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Received on Wednesday, 21 February 2001 00:47:57 UTC