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The introduction of the Primer indicates that the Primer is non-normative, but the status section indicates it may be cited as a normative reference. See http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001AprJun/0155.html
An erratum E0-2 was added indicating that the text in the Status section be modified to remove any statement that the Primer may be referenced normatively.