MAJOR:

1. Support for XER decoding.
   Status:	The BASIC-XER and CANONICAL-XER are implemented.
		The XER decoding is not yet implemented.

2. Support for PER encoding. Requires advanced subtype constraints support,
which is already completed.

3. Support for Information Object Classes.
   Status:	Support for parsing IOCs is mostly present.
		Support for slicing the IOCs to produce "views"
		is not yet designed.

MEDIUM:

1. Support for DEFAULT encoding and decoding, at least in INTEGER/ENUMERATED types.
2. Support for EXTERNAL, EMBEDDED-PDV and CHARACTER STRING types.

MINOR:

1. Parsing of CONSTRAINED BY clauses