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----- Original Message -----
From: "Jeff Rafter" <lists@jeffrafter.com>
Sent: Thursday, October 28, 2004 1:32 PM
> I was wondering if I could get some clarification on this paragraph:
>
> http://www.w3.org/TR/REC-xml/#wf-entdeclared
>
> "Note that non-validating processors are not obligated to to read and
> process entity declarations occurring in parameter entities or in the
> external subset; *for such documents*, the rule that an entity must be
> declared is a well-formedness constraint only if standalone='yes'."
> (emphasis added).
>
> My question is as follows-- if you have a non-validating processor which
> is processing entity declarations occurring in PEs or the ExtSubset is
> it also a violation of the WFC if it encounters an undeclared entity
> ref even when standalone="no"?
>
> I can't find a good way to make clear what I am asking-- I think my
> expectation was that instead of "for such documents" it would read "for
> such processors". There is an important distinction there and I think I
> have just read it wrong so many times I can't get it straight.
When I re-implemented this in Expat, I found this WFC hard to understand,
so I rewrote it. Below is an excerpt from my patch description:
--- start ---
1) Re-implementation of WFC: Entity Declared.
I re-wrote the WFC in a way that was easier to understand for me:
First, I split the problem into two questions:
Q1) *When* should one check if a reference matches an entity declaration
in the right location?
This is different depending on whether the reference is in the DTD
or the document content,
DTD:
The reference is in the internal subset, and:
a) If standalone = "yes": the reference is outside of any PE
b) If standalone = "no" or undefined: So far no PE has been read
(which implies the reference is outside of any PE)
Document content:
A) The document has no DTD
B) The document has only an internal subset, and this subset contains
no PE references
C) standalone = "yes"
Q2) What should one check then?
Reference in DTD *and* document content:
An entity declaration with matching name was read, which is in the
internal subset, but outside of any PE (which is automatically given
in case Q1)-DTD-b)).
DTD:
GE references in default attribute values must come after the matching
GE declaration.
--- end ---
Btw, I worked on this in conjunction with section 5.1 of the spec.
Hope that helps,
Karl
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