[ASN.1] A CHOICE of OPERATIONs?

[Daniel Sv�rd]

Hi

I'm fairly new to this, so please respond however simple the answer might be 
to you.

I'm trying to write a "root element" for the MAP protocol asn1 code, which 
consists of a lot of OPERATION elements.

My first instinct is to put all OPERATIONs in a CHOICE tag, sort of like 
this:

RootElement ::= CHOICE {
        messageType1    [1] MessageType1,
        messageType2    [2] MessageType2,
        messageType3    [4] MessageType3
}
.. but it's not working.
I've tried a lot of desperate combinations like
RootElement ::= CHOICE {
        messageType1    [APPLICATION 1] IMPLICIT MessageType1,
        messageType2    [APPLICATION 2] IMPLICIT MessageType2,
        messageType3    [APPLICATION 4] IMPLICIT MessageType3
}
and

RootElement {OPERATION : MessageType1, OPERATION: MessageType2, OPERATION: 
MessageType3} ::= CHOICE {
	messageType1	[1] MessageType1,
	messageType2	[2] MessageType2,
	messageType3	[4] MessageType3
}

Any pointers?

Br,
Daniel Sv�rd


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