Non-Validating XML Parsers: Requirements

John Cowan cowan at
Tue Aug 4 20:35:02 BST 1998

Chris Hubick wrote:

>         I thought this document was well formed, I read "PEs in Internal
> Subset" to mean that you can't have stuff like:
> <!ELEMENT dictionary-body (%div.mix; | %dict.mix;)*>
> but you can have:
> <!DOCTYPE test [
> <!ENTITY % xx '<!--example-->'>
> %xx;
> ]>
> but looking at the EntityValue production:
> [9]  EntityValue ::=  '"' ([^%&"] | PEReference | Reference)* '"'
>    |  "'" ([^%&'] | PEReference | Reference)* "'"
> It allows a PEReference in an entity value, and thus I thought it was well
> formed.

Good point.  I think there is a genuine conflict here.  But I read
clause 4.5 (allowing PE references in entity values) in conjunction
with the WF constraint "PEs in Internal Subset", and I believe
that internal entity declarations within the internal subset may
not contain PEs in the entity value.

Can we get a more authoritative or more knowledgeable commentator?

> [T]he supplied grammer was for the internal subset, and knew I didn't have
> to worry about the external in the first round because I didn't want to
> validate.

The supplied DTD grammar is actually for either subset *after* PE
references have been expanded and conditional sections removed

John Cowan		cowan at
	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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