PtyRegnAndGrntNtfctn
                Mandatory
                Hdr
                Mandatory
                ApplCntxt
                Optional
                LttrIdr
                Mandatory
                Dt
                Mandatory
                RltdLttr
                Repetition (0..n)
                RltdMsg
                Repetition (0..n)
                CnttIdr
                Repetition (0..n)
                InstrPrty
                Optional
                Orgtr
                Mandatory
                PmryRcpt
                Repetition (1..n)
                Sndr
                Repetition (0..n)
                AuthstnUsr
                Repetition (1..n)
                RspnRcpt
                Repetition (0..n)
                CpyRcpt
                Repetition (0..n)
                OthrPty
                Repetition (0..n)
                AssoctdDoc
                Repetition (0..n)
                GovngCtrct
                Repetition (0..n)
                LglCntxt
                Repetition (0..n)
                AddtlInf
                Optional
                Ntce
                Optional
                VldtnStsInf
                Optional
                Digital Signature
DgtlSgntr
                Repetition (0..n)
                Definition: Digital signatures and signing parties of this letter or parts of it.
Type: QualifiedPartyAndXMLSignature1
Pty
                Optional
                Sgntr
                Mandatory
                NtfctnList
                Repetition (1..n)
                NtfctnCnt
                Optional
                ItmCnt
                Optional
                CtrlSum
                Optional
                AttchdMsg
                Repetition (0..n)