AdddmInitn
                Mandatory
                Hdr
                Mandatory
                Body
                Optional
                Envt
                Mandatory
                Cntxt
                Optional
                Tx
                Mandatory
                AdddmData
                Mandatory
                PrtctdData
                Repetition (0..n)
                CnttTp
                Mandatory
                EnvlpdData
                Optional
                Vrsn
                Optional
                Rcpt
                Repetition (1..n)
                NcrptdCntt
                Optional
                Content Type
CnttTp
                Mandatory
                Definition: Type of data which have been encrypted.
Type: ContentType2Code (String)
Allowed Values:
- DATA (Plain Data): Generic, non cryptographic, or unqualified data content - (ASN.1 Object Identifier: id-data).
- SIGN (Signed Data): Digital signature - (ASN.1 Object Identifier: id-signedData).
- EVLP (Enveloped Data): Encrypted data, with encryption key - (ASN.1 Object Identifier: id- envelopedData).
- DGST (Digested Data): Message digest - (ASN.1 Object Identifier: id-digestedData).
- AUTH (Authenticated Data): MAC (Message Authentication Code), with encryption key - (ASN.1 Object Identifier: id-ct-authData).
CnttNcrptnAlgo
                Mandatory
                NcrptdDataElmt
                Repetition (1..n)
                NcrptdData
                Optional
                SplmtryData
                Repetition (0..n)
                SctyTrlr
                Optional