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In discussions of SCDs, various questions regarding the component model surfaced such as: how many components are there for particles inherited by extensions of a complextype?
See also bug 2842, which appears to be a duplicate of this one.
In our call of 22 December 2006, the Working Group discussed this question and concluded that the correct answer is "no more than necessary" -- i.e. the content model particle of the base type is not copied, but reused, in the content model of the extension. The editors believe that this is already a consequence of the normative prose in the spec. The editors and WG members should keep an eye open for text that appears to contradict that rule, and for a good location to add a clarifying note about the facts of the case. The WG agreed to resolve this
Bug was previously closed, but requires clarification, so it is being reopened. ACTION 2006-12-22.5: editors to find a good place for a note clarifying the status quo portions addressed in 2195.
A wording proposal for this issue (among others) was sent to the XML Schema WG on 4 February 2008. http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.consent.200802.html (member-only link) For some issues, the proposal is effectively to make no change; see the Status section of the proposal for the specifics.
During its telcon today, the XML Schema WG accepted the 'Structures Omnibus 2' proposal, which includes changes intended to resolve this issue. (Or, for some issues, contains the editors' proposal that the issue should be closed without further changes.) http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.consent.200801.html (member-only link) Accordingly, I'm marking the issue resolved. The originator of this issue (or in some cases the individual, acting on behalf of a group, who filed the comment) should receive an email notification of this change. Please examine the changes and let us know if you agree with this resolution of your issue, by adding a comment to the issue record and changing the Status of the issue to Closed. Or, if you do not agree with this resolution, please add a comment explaining why. If you wish to appeal the WG's decision to the Director, then also change the Status of the record to Reopened. If you wish to record your dissent, but do not wish to appeal the decision to the Director, then change the Status of the record to Closed. If we do not hear from you in the next two weeks, we will assume you agree with the WG decision.