namespace xsi = "http://www.w3.org/2001/XMLSchema-instance" CanonicalUser = element ID { xsd:string } & element DisplayName { xsd:string }? StorageClass = "STANDARD" | "REDUCED_REDUNDANCY" | "GLACIER" | "UNKNOWN" AccessControlList = element Grant { element Grantee { ( attribute xsi:type { "AmazonCustomerByEmail" }, element EmailAddress { xsd:string } ) | ( attribute xsi:type { "CanonicalUser" }, CanonicalUser ) | ( attribute xsi:type { "Group" }, element URI { xsd:string } ) } & element Permission { "READ" | "WRITE" | "READ_ACP" | "WRITE_ACP" | "FULL_CONTROL" } }*