Re: XSL FO DTD problems

["James Tauber" <jtauber@xxxxxxxxxxx>]

----- Original Message -----
From: Ed Nixon <ed.nixon@xxxxxxxxxxxxxxxxx>
To: <xsl-list@xxxxxxxxxxxxxxxx>
Sent: Saturday, 26 June 1999 6:27
Subject: RE: XSL FO DTD problems


> What is the significance of the fact that the XSL DTD cannot be expressed
> in... XML (syntax, semantics, whatever...)?

Only that XML DTDs are not as expressive as SGML DTDs in constraining
instance structure.

When developing document types, no matter what schema language you use,
there are going to be some things you can formally express in that schema
language and stuff that you have to express with prose or code or something
similar. The richer the expressive capability of the schema language, the
less you have to rely on these other things.

I guess you always have to balance the expressiveness of your chosen schema
language with how widespread machine and/or human understanding of it is.

James


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