>  Could someone please point out the differences for BER encoding between
> ASN:1990 and ASN:1997 ?

To maintain compatibility, there should not be changes in the encoding,
only additions. For instance, neither Information Object Classes nor
Parameterization was present in 1990, but their presence in 1997 does not
affect the encoding of anything which was valid in 1990. Thus a valid BER
encoding in 1990 remains a valid BER encoding in 1997.

Do you have a particular difficulty or are you indeed looking for a
general answer to a general question?

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