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+The following restrictions apply to this implementation of the ASN.1 compiler:
+
+Supported encoding rules are:
+BER
+PER (aligned)
+
+PER (unaligned) IS NOT SUPPORTED
+
+Supported types are:
+
+INTEGER
+BOOLEAN
+ENUMERATION
+SEQUENCE
+SEQUENCE OF
+SET
+SET OF
+CHOICE
+OBJECT IDENTIFIER
+RestrictedCharacterStringTypes
+UnrestrictedCharacterStringTypes
+
+
+NOT SUPPORTED types are:
+ANY IS (IS NOT IN THE STANDARD ANY MORE)
+ANY DEFINED BY (IS NOT IN THE STANDARD ANY MORE)
+EXTERNAL
+EMBEDDED-PDV
+REAL
+
+The support for value definitions in the ASN.1 notation is very limited.
+
+The support for constraints is limited to:
+SizeConstraint SIZE(X)
+SingleValue (1)
+ValueRange (X..Y)
+PermittedAlpabet FROM
+
+The only supported value-notation for SEQUENCE and SET in Erlang is
+the record variant.
+The list notation with named components used by the old ASN.1 compiler
+was supported in the first versions of this compiler both are no longer
+supported.
+
+The decode functions always return a symbolic value if they can.
+
+
+Files with ASN.1 source must have a suffix .asn1 the suffix .py used by the
+old ASN.1 compiler is supported in this version but will not be supported in the future.
+
+Generated files:
+X.asn1db % the intermediate format of a compiled ASN.1 module
+X.hrl % generated Erlang include file for module X
+X.erl % generated Erlang module with encode decode functions for
+ % ASN.1 module X