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"
    }
  }*