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The Datatypes rec and the Schema for Datatypes do not allow the value "extension" for the final attribute of a simpleType. However, section 3.4.6 of the Structures rec (under Derivation Valid (Extension)) says: 2 If the {base type definition} is a simple type definition, then all of the following must be true: 2.1 The {content type} must be the same simple type definition. 2.2 The {final} of the {base type definition} must not contain extension. It seems that 2.2 will always be true. Is this an oversight? See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001OctDec/0067.html
See: http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001OctDec/0068.html and http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001OctDec/0069.html Resolution: Resolved at the March 8 telecon to class R-84 as clarification with erratum and change the Structures spec to agree with Datatypes as regards final='extension' on simple types.
Discussed at 2005-09-28 F2F meeting. RESOLVED: Change the component of 2074 to Datatypes, remain as needs drafting, reassign to cmsmcq@w3.org [11:14] ht: ... record a new resolution so that it is a direction to bring 1.0 datatypes in to line with the change agreed for 1.1, i.e. that {final} may include 'extension', and relevant comments about its use.
http://www.w3.org/Bugs/Public/show_bug.cgi?id=2234 is related, currently (2005-11-03) comes to the wrong conclusion
http://www.w3.org/Bugs/Public/show_bug.cgi?id=2438 is the 1.1 fix for this problem