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The Primer shows the application information element as <appInfo> while Structures defines it as <appinfo>. See http://lists.w3.org/Archives/Public/www-xml-schema-comments/2001JulSep/0104.html
Tentative resolution: http://www.w3.org/XML/Group/2001/10/xml-schema-ftf-minutes#ab1b3b3b3b1b4 The Structures spec is correct. The editor will create an erratum for the Primer. Erratum E0-14 added.