Non-Validating XML Parsers: Requirements

Richard Tobin richard at
Tue Aug 4 12:14:08 BST 1998

> This would mean that the grammer has PE
> references in places that are not allowed in the internal subset,

Yes; a document must satisfy the grammar rules and the constraints.

> suggesting those are only valid in the external subset, yet the
> grammer leaves them out in many places where they are allowed in the
> external subset!

Earlier drafts of the standard attempted to indicate where paramater
entities could occur by special syntax in the grammar rules.  This made
them very hard to read.

I think that to do this right would need two grammars; one for the
unexpanded source and one for the result after expansion.

-- Richard

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