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The editorial note in 2.2.4.3 (" Assertions are currently only allowed to be specified in complex types. ...") is clearly obsolete.
On 2008-09-26, the working group adopted a proposal to address this issue by removing the Obsolete editorial note. The proposal (along with changes for other bugs) can be found at (member-only): http://www.w3.org/XML/Group/2004/06/xmlschema-1/structures.editorial0809.html