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   Re: Roots of the DTD

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  • From: John Cowan <cowan@locke.ccil.org>
  • To: XML Dev <xml-dev@ic.ac.uk>
  • Date: Fri, 05 Jun 1998 09:52:43 -0400

Ron Bourret wrote:

> A default root might fly.  Certainly a mandatory root is wrong.
> In many ways, the XSchema PI is like DOCTYPE -- it points to a document
> containing the structure of your document.  As Simon suggested, it should
> therefore have a way to specify the root element, similar to the doc-type in the
> DOCTYPE declaration.

I agree.

> Unfortunately, these raises conflicts between DOCTYPE and the XSchema PI, since
> they are two different ways to do the same thing.

I think this is just a special case of XSchema PI vs !DOCTYPE conflict
in general.  After all, a document might insist that it conforms
to a.dtd and b.xschema.xml, where a is not in any way transformable
to b.  With a well-chosen document and a and b, the document might
even pass validation.

> I don't like telling people they can use DOCTYPE or XSchema PIs but not both.  I
> also don't like having to write a long list of conflict resolutions -- it just
> makes XSchemas harder to use.  In both cases, it feels like we are imposing
> requirements not in the XML spec.  Ideas?

I say, give the users plenty of rope, and if they hang themselves,
they hang themselves.  However, I would say that a document conforms
to an XSchema if its actual root is an element defined in the XSchema,
even if the XSchema-PI doesn't declare any root.

John Cowan	http://www.ccil.org/~cowan		cowan@ccil.org
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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