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   Re: XSchema Spec Section 2.3, Draft 1

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  • From: John Cowan <cowan@locke.ccil.org>
  • To: XML Dev <xml-dev@ic.ac.uk>
  • Date: Thu, 11 Jun 1998 14:15:39 -0400

Simon St.Laurent wrote:

> I can accept dropping the PCData - it takes out a nuisance declaration - but
> now I wonder about PCData elements.  They're technically Mixed but without any
> optional elements.  Do we need PCData elements?

That was my original design.  Ron thought it was clearer to allow
an explicit PCData element equivalent to an empty Mixed element,
and I acquiesced.
> Also, why does the element need a frequency attribute?  Isn't that built into
> the nature of Mixed?  It's not like you can nest a Mixed content model under a
> Choice or Seq directly or anything...

It *is* "built in", which is why it can sensibly be represented by a
#FIXED attribute.  That way, people can see Mixed, Seq, and Choice
as adhering to a common "frequency architecture".  Just a thought,
not anything I'm fanatical about.

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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