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Jim Melton wrote:
> They were both designed by "doc-heads", not by "data-heads" who
>have a much different view of the world.
Of course, much of the data in the heads of the data-heads is
object-oriented, in which "attributes" (which admittedly aren't quite
the same as the SGML/XML ones) are also implicitly unordered.
I think that doc-heads are much more interested in sequential ordering
of data than the data-heads, who, when not thinking in terms of objects
are thinking in terms of tables of unordered rows.
(See  for my picture of a data-head and a doc-head. It accompanied my
XML 2004 presentation and paper "Documents vs. Data, Schemas vs.