A note is an additional piece of information added by an analyst to explain, illustrate or comment a particular part of a model instance. A note should not attempt to constrain or restrict an object set or a relationship set.
Notes are equivalent in function to a comment in a programming language.
A note has no semantic meaning in a model instance. Notes may appear anywhere in a model instance and always appear in italic text to distinguish notes from text with semantic meaning. The lexical form of a note is a double dash followed by the text of the note. Usually notes have a line of dashes above and below the text of the note. The note is terminated by a newline character.