ASN1 DEFINITIONS ::=
BEGIN


CP_type ::= SET {
	mode_selector [0] IMPLICIT Mode_selector,
	--x410_mode_parameters [1] IMPLICIT SET {
	--	COMPONENTS OF Reliable_Transfer_APDUs.RTORQapdu
	--} OPTIONAL,
	--- Shall be used for X.410 mode only. Shall be bitwise
	--- compatible with CCITT Recommendation X.410_1984.
	--- This shall be the User data parameter of the CP PPDU1)
	normal_mode_parameters [2] IMPLICIT SEQUENCE {
		protocol_version [0] IMPLICIT Protocol_version DEFAULT {version_1},
		calling_presentation_selector [1] IMPLICIT Calling_presentation_selector OPTIONAL,
		called_presentation_selector [2] IMPLICIT Called_presentation_selector OPTIONAL,
		presentation_context_definition_list [4] IMPLICIT Presentation_context_definition_list OPTIONAL,
		default_context_name [6] IMPLICIT Default_context_name OPTIONAL,
		presentation_requirements [8] IMPLICIT Presentation_requirements OPTIONAL,
		user_session_requirements [9] IMPLICIT User_session_requirements OPTIONAL
		-- shall not be present if equal to the Revised session
		-- requirements parameter -- ,
		user_data User_data OPTIONAL
	} OPTIONAL
	-- Shall be used for normal mode only.
	-- Shall be the parameters of the CP PPDU.
}

CPA_PPDU ::= SET {
	mode_selector [0] IMPLICIT Mode_selector,
	--x410_mode_parameters [1] IMPLICIT SET {
	--	COMPONENTS OF Reliable_Transfer_APDUs.RTOACapdu
	--} OPTIONAL,
	--- Shall be used for X.410 mode only. Shall be bitwise
	--- compatible with CCITT Recommendation X.410_1984.
	--- This shall be the User data parameter of the CPA PPDU1)
	normal_mode_parameters [2] IMPLICIT SEQUENCE {
		protocol_version [0] IMPLICIT Protocol_version DEFAULT {version_1},
		responding_presentation_selector [3] IMPLICIT Responding_presentation_selector OPTIONAL,
		presentation_context_definition_result_list [5] IMPLICIT Presentation_context_definition_result_list OPTIONAL,
		presentation_requirements [8] IMPLICIT Presentation_requirements OPTIONAL,
		user_session_requirements [9] IMPLICIT User_session_requirements OPTIONAL,
		-- shall not be present if equal to the Revised session
		-- requirements parameter --
		user_data User_data OPTIONAL
	} OPTIONAL
	-- Shall be used for normal mode only.
}

Responding_presentation_selector ::= Presentation_selector
Presentation_context_definition_result_list ::= Result_list

Result_list ::= SEQUENCE OF SEQUENCE {
	result [0] IMPLICIT Result,
	transfer_syntax_name [1] IMPLICIT Transfer_syntax_name OPTIONAL,
	provider_reason [2] IMPLICIT INTEGER {
		reason_not_specified (0),
		abstract_syntax_not_supported (1),
		proposed_transfer_syntaxes_not_supported (2),
		local_limit_on_DCS_exceeded (3)
	} OPTIONAL
}

Result ::= INTEGER {
	acceptance (0),
	user_rejection (1),
	provider_rejection (2)
}

Mode_selector ::= SET { 
	mode_value [0] IMPLICIT INTEGER { x410_1984_mode (0), normal_mode (1) } 
}


User_data ::= CHOICE {
	simply_encoded_data [APPLICATION 0] IMPLICIT Simply_encoded_data,
	fully_encoded_data [APPLICATION 1] IMPLICIT Fully_encoded_data
}
-- Subclause 8.4 defines when each of the two alternatives shall be used.

Simply_encoded_data ::= OCTET STRING
-- See 8.4.1.

Fully_encoded_data ::= SEQUENCE OF PDV_list
-- contains one or more PDV_list values.
-- See 8.4.2.

PDV_list ::= SEQUENCE {
	transfer_syntax_name Transfer_syntax_name OPTIONAL,
	presentation_context_identifier Presentation_context_identifier,
	presentation_data_values CHOICE {
		single_ASN1_type [0] ANY,
		-- Type corresponding to presentation context identifier
		octet_aligned [1] IMPLICIT OCTET STRING,
		arbitrary [2] IMPLICIT BIT STRING
	}
	-- Contains one or more presentation data values from the same
	-- presentation context.
	-- See 8.4.2.
}


Presentation_context_definition_list ::= Context_list

Context_list ::= SEQUENCE OF SEQUENCE {
	presentation_context_identifier Presentation_context_identifier,
	abstract_syntax_name Abstract_syntax_name,
	transfer_syntax_name_list SEQUENCE OF Transfer_syntax_name
}

Presentation_context_identifier ::= INTEGER
Abstract_syntax_name ::= OBJECT IDENTIFIER
Transfer_syntax_name ::= OBJECT IDENTIFIER
Protocol_version ::= BIT STRING { version_1 (0) }
Calling_presentation_selector ::= Presentation_selector
Called_presentation_selector ::= Presentation_selector
Presentation_selector ::= OCTET STRING


Default_context_name ::= SEQUENCE {
	abstract_syntax_name [0] IMPLICIT Abstract_syntax_name,
	transfer_syntax_name [1] IMPLICIT Transfer_syntax_name
}

Presentation_requirements ::= BIT STRING { context_management (0), restoration (1) }

User_session_requirements ::= BIT STRING {
	half_duplex (0),
	duplex (1),
	expedited_data (2),
	minor_synchronize (3),
	major_synchronize (4),
	resynchronize (5),
	activity_management (6),
	negotiated_release (7),
	capability_data (8),
	exceptions (9),
	typed_data (10),
	symmetric_synchronize (11),
	data_separation (12)
}

END