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   Re: SDD again

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  • From: alex@veosystems.com
  • To: xml-dev@ic.ac.uk
  • Date: Fri, 8 May 1998 18:17:57 -0700 (PDT)

David Megginson writes:

> Paul Prescod writes:
>  > Let me risk another step into the language courtroom. Validating
>  > parsers must always read the whole DTD. So the SDD is only for
>  > non-validating parsers. Non-validating parsers do not read element
>  > type declarations. So what is the point of this line:
> Your first premise is correct, but your second one is not.  The spec
> states that a validating parser must use the whole DTD; it does not
> state that a non-validating parser may not use the DTD.  AElfred, for
> example, reads the DTD well enough that it can even flag ignorable
> whitespace base on an element type's content model, but it is
> non-validating.

..which means, if your parser is not a validating parser, what you receive
and can do will vary.  We have a "grayness" between well-formed and
validating that doesn't sit too well.
> That said, I still agree that the standalone declaration is wrong.
> Perhaps some day, if there's an XML 1.1, we can think about fixing it.

Absolutely.  We need well defined classes of parsers so that implementors
and users can require a certain level of processing.  We also need 
conformance test suites for these each class of parser.

Currently, validating parsers are the only real *safe* bet.

R. Alexander Milowski      alex@veosystems.com     (612) 825-4132       v|e|o
                          MOS | sed s/SG/X/g > DYX

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