A unique identifier that guarantees the global uniqueness of the instance identifier. The root alone may be the entire instance identifier. A character string as a unique identifier within the scope of the identifier root. A human readable name or mnemonic for the assigning authority. This name may be provided solely for the convenience of unaided humans interpreting an II value and can have no computational meaning. Note: no automated processing must depend on the assigning authority name to be present in any form. Specifies if the identifier is intended for human display and data entry (displayable = true) as opposed to pure machine interoperation (displayable = false).