RE: expressing DTDs with UML

To your example:
package - document type
	I prefer namespace at this point. I'm still working out what nested
packages imply for namespaces.

class - a tag
attribute - a tag parameter
	Heading down the path of "all content in attribute values" here. I
suppose you could stereotype one class attribute as <<Content>>.

association - hyperlink
	UML can show navigation, so you can show which end implies an ID
attribute, which end an IDREF. It is time to start thinking about generating
XLink link attributes as well, so we need to stereotype the association as
<<ID/IDREF>> or <<XLINK>>

aggregation - allows expression of tag hierarchy e.g. <car> ... <wheel
location="left_rear"></wheel></car>
	UML has a hard time with ordered content. A DTD often expresses a
content model with sequence constraints "(head,para*)". Notice how easy it
is to find an example from the XML-as-document space rather than the
XML-as-data space.

inheritance - a means for sharing / inheriting attributes, relationships

	DTDs as defined today don't need/use methods.

	Overall, though, I think it is less interesting to figure out how to
model DTDs with UML than it is to map business models developed in UML into
DTDs, without bending the business model to fit a preconceived notion of
what a good DTD should look like.
Cheers,
David vun Kannon
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