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i think the annotation is simple saying that something that looks like a parameter entity such as %Fred; that appears outside of a DTD will simple be interpreted as the text '%Fred;', not as a parameter entity. hence the constraint is necessary, otherwise the expression would be a parameter entity regardless of its context. jon > -----Original Message----- > From: Elliotte Rusty Harold [SMTP:elharo@m...] > Sent: Thursday, October 12, 2000 8:38 PM > To: xml-dev > Subject: Unnecessary well-formedness constraint > > Section 4-1 of the XML 1.0 second edition spec states: > > > Well-Formedness Constraint: In DTD > Parameter-entity references may only appear in the DTD. > > > The Annotated XML spec notes that: > > This constraint is not actually wrong, but it is rather misleading. > Suppose I have a parameter entity named Fred, then if the string %Fred; > appears somewhere in the document, outside of the DTD, that's not an > error as this suggests; it's just the string %Fred;. > > So my question is why is this constraint here at all? What is its > effect? If we removed it form the spec (say in the third edition) would > this in any way change which document are considered to be well-formed > or valid? Would removing it give parsers any leeway they don't have now? > Right now this seems like an unnecessary statement to me. > > -- > +-----------------------+------------------------+-------------------+ > | Elliotte Rusty Harold | elharo@m... | Writer/Programmer | > +-----------------------+------------------------+-------------------+ > | Java I/O (O'Reilly & Associates, 1999) | > | http://metalab.unc.edu/javafaq/books/javaio/ | > | http://www.amazon.com/exec/obidos/ISBN=1565924851/cafeaulaitA/ | > +----------------------------------+---------------------------------+ > | Read Cafe au Lait for Java News: http://metalab.unc.edu/javafaq/ | > | Read Cafe con Leche for XML News: http://metalab.unc.edu/xml/ | > +----------------------------------+---------------------------------+
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