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- From: Paul Prescod <email@example.com>
- To: Andrew Layman <firstname.lastname@example.org>
- Date: Wed, 16 Jun 1999 06:28:31 -0400
Andrew Layman wrote:
> I suggest that there is a vast difference between something such as a
> schema, which creates identifiers and gives them a definition, and other
> resources such as style sheets that may be permanently or ephemerally
> associated with those identifiers. One defines the data; the other
> indicates processing.
It seems to me to be entirely debatable whether a schema defines element
and attribute types or whether it just constrains their use. My personal
take is that the schema merely contrains use.
Consider that I have a document that is an HTML document. Is the most
important feature of the P elements in the document that they are globally
known as "HTML paragraphs" (their semantics) or the details of the element
type declaration in the DTD? If I swap in another variant of the HTML DTD
with another set of element type declarations have I completely changed
the nature of those element types?
If I have a CDF document without a DTD or schema would it be accurate to
say that those element types are "undefined"? Or merely not defined in a
manner that would allow a computer to check validity using a standardized
If I have two schemas for a document, in two different schema languages,
must one be the "definitive" schema and the other non-definitive?
Paul Prescod - ISOGEN Consulting Engineer speaking for only himself
[Woody Allen on Hollywood in "Annie Hall"]
Annie: "It's so clean down here."
Woody: "That's because they don't throw their garbage away. They make
it into television shows."
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