<xs:attribute name="clickaction" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:simpleType>
    <xs:restriction base="xs:string">
      <xs:enumeration value="auto" />
      <xs:enumeration value="camera" />
      <xs:enumeration value="file" />
      <xs:enumeration value="none" />
      <xs:enumeration value="picture" />
    </xs:restriction>
  </xs:simpleType>
</xs:attribute>