Hello, Mr. Walkin.

I am using the ASN.1 compiler and for an application I am developing. I am using this to store the datastructure in a file, for persistence. I am trying to find out whether forward compatibility is support. By this I mean the following.

In the version 1 I have the following structure:

Struct a {
	Int x;
	Int y;
	Int z;
}

I store the data x = 111; y = 222 and z = 333;

Now I upgrade the software to the version 2 where in the new struct is:

Struct a {
	Int x;
	// int y is removed
	Int z;
}

Now when I read the existing file (generated with the older version of ASN.1 specification) with the newer version of the software, I get the following data back: x = 111, and z = 222.

Can you please tell me whether it is possible to get x = 111 and z = 333. If yes, then what ASN syntax should I follow? I am using der_encode and ber_decode.