Minor implementation issue: description element

Currently it is not possible to include more than one description element for any CDL element - i.e. it is defined as optional (0 or 1).

However, the <description> has a type, which can be documentation, reference or semantics.

Therefore if we wanted to add a documentation (textual) description element, as well as a semantics description element, for the same CDL element, this would not be valid according to the schema.

Suggest making this <description> element 0 to many cardinality.

Regards
Gary