XSchema: root element

[Chris Maden]

[John Cowan]
> I propose: Root (Useful | NotUseful) "NotUseful".

I would prefer

Root (Useful | NotUseful) #IMPLIED

Most DTDs have a number of useful potential roots and a number of
not-so-useful ones.  By providing a default value one way or the
other, you force me to override it on a substantial portion of my
elements.

Another option is to just say that this is a suggested root:

Root (Suggested) #IMPLIED

For DocBook, for instance, there are many elements useful as roots,
but I might only put Root="Suggested" on <book>'s declaration.

-Chris
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