List of potential interop test cases
1. 4514 allows attribute type keywords to be of length 1, whereas 2253 requires them to be at least length 2.
I think this is a bug in the grammar of RFC 2253, and any implementations that enforce a length of 2 cannot really be usable. For example, "C=US" is not valid under a strict interpretation.
2. 4514 requires spaces to be escaped whereas 2253 doesn't permit spaces to be escaped.
Another bug in the RFC 2253 grammar as I mentioned in a prior email [1]
3. 4514 requires null characters to be escaped whereas 2253 doesn't permit null characters to be escaped.