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   Re: Ambiguity in XML spec

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  • From: John Cowan <jcowan@reutershealth.com>
  • To: "Brown, Bryan" <bryanb@upshot.com>, "xml-dev@xml.org" <xml-dev@xml.org>
  • Date: Fri, 19 May 2000 12:42:09 -0400

"Brown, Bryan" wrote:

> Ok, well I have a parser that i wrote from scratch, and of the 83 or so
> productions this is the only one my parser has a problem with. If when a
> NotationDecl has a publicID the systemliteral is optional (which is what the
> current spec implies)

That is so.  However, it is the *only* place where a public ID need not be
followed by a system ID.

> then the spec should have had productions like the
> following
> [83] NotationDecl ::= '<!NOTATION' S Name S (SystemID | PublicID )
> [84] PublicID ::= 'PUBLIC' S PubicLiteral (S SystemLiteral)?
> [85] SystemID ::= 'SYSTEM' S SystemLiteral

This one is technically correct, but confusing because of the use of PublicID
in a way which is specific to notations only (everywhere else ExternalID is used).

> Or
> [[83] NotationDecl ::= '<!NOTATION' S Name S (ExternalID | PublicID )
> [84] PublicID ::= 'PUBLICID' S PubicLiteral

Eh?  That is what it does say.


Schlingt dreifach einen Kreis um dies! || John Cowan <jcowan@reutershealth.com>
Schliesst euer Aug vor heiliger Schau,  || http://www.reutershealth.com
Denn er genoss vom Honig-Tau,           || http://www.ccil.org/~cowan
Und trank die Milch vom Paradies.            -- Coleridge (tr. Politzer)

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