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[Bug 2235] R-243: Can an attribute prohibited by restriction be added back through a subsequent extension?

From: <bugzilla@wiggum.w3.org>
Date: Wed, 14 Sep 2005 19:36:27 +0000
To: www-xml-schema-comments@w3.org
Cc:
Message-Id: <E1EFd3T-0001vI-96@wiggum.w3.org>

http://www.w3.org/Bugs/Public/show_bug.cgi?id=2235

           Summary: R-243: Can an attribute prohibited by restriction be
                    added back through a subsequent extension?
           Product: XML Schema
           Version: 1.0
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSD Part 1: Structures
        AssignedTo: ht@w3.org
        ReportedBy: sandygao@ca.ibm.com
         QAContact: www-xml-schema-comments@w3.org


The REC says in clause 1.5 of Schema Component Constraint: Derivation Valid 
(Extension): 

Note: This requirement ensures that nothing removed by a restriction is 
subsequently added back by an extension. 

That is where the REC tries to answer "no" to the question of "whether an 
attribute [or element] removed by restriction could be added back in an 
extension." However the constraint itself, in my view, fails to achieve this, 
so processors which allow it are not broken. 

I think we should fix this one way or another: 

1. No constraint on re-introduction; 
2. No re-introduction of any kind (apparent intention of current REC); 
3. Re-introduction of unchanged originals only (what the current REC actually 
says)? 

See:
http://lists.w3.org/Archives/Public/www-xml-schema-comments/2004JanMar/0005.html
Received on Wednesday, 14 September 2005 19:36:30 GMT

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