xmlschema-core/src/test/resources/appInfo.xsd

<xs:schema targetNamespace="http://foo" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:annotation>
    <xs:appinfo>
      <ns01:bar xmlns:ns01="http://anyuri"/>
    </xs:appinfo>
  </xs:annotation>
</xs:schema>