RE: PUBLIC id in notations

Please check again:
 
XML 1.0 Rec requires PublicId-s at notations.  See
http://www.w3.org/TR/REC-xml#Notations
<http://www.w3.org/TR/REC-xml#Notations> 
 
XML Schema Spec at http://www.w3.org/TR/xmlschema-1/#cNotation_Declarations
<http://www.w3.org/TR/xmlschema-1/#cNotation_Declarations> 
says only that either the Public or System Identifiers must be present.
 
Anli Shundi
TIBCO Extensibility
www.extensibility.com <http://www.extensibility.com> 

-----Original Message-----
From: Anderson, John [mailto:John@Barbadosoft.com]
Sent: Tuesday, January 29, 2002 10:22 AM
To: xml-dev@lists.xml.org; W3C XML Schema IG; xmlschema-dev@w3.org
Subject: PUBLIC id in notations



Anyone who can advise: 

Some time ago I raised the issue of discrepancies between XML1.0 and XML
Schema with regard to notations, but I've forgotten the outcome and can't
find the thread. Can anyone can enlighten me?

XML1.0 says that the PUBLIC identifier is optional. The schema rec cannot
make up it's mind. 

In 3.12.1 "The Notation Declaration Schema Component", public identifier is
given as optional. 

In 3.12.2 "XML Representation of Notation Declaration", and in the schema
for Schema, it is given as mandatory (and is treated this way by a number of
processors). Of course, the schema for schemas has no choice, since at least
one of system or public is required and XSD can't express this as a
co-constraint.

Can anyone explain: 
a) Why this mismatch with XML1.0 was introduced in XSD? 
b) Is it actually a bug which will be changed? 
c) If it isn't a bug, what is the recommended way of converting DTDs into
XSD when no public identifiers are given? 

Any help appreciated. 

John 



_______________________________________________________
John Anderson 
CTO BarbadosoftTM 
The XML Management Company 
+31 (0)20 750 7582 / +31 (0)6 55 347 448 / www.barbadosoft.com 

- putting the "X" in "XML" - 


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