UML22 — Page: 53-55

In UML v. 2.0, formal/05-07-04: IF 7.3.9 Comment -> Semantics -> "A Comment adds no semantics to the annotated elements,..." AND 7.3.10 Constraint -> "A constraint is a condition or restriction expressed in natural language text or in a machine readable language for the purpose of declaring some of the semantics of an element." AND 7.3.10 Constraint -> Semantics -> "A Constraint represents additional semantic information attached to the constrained elements." AND 7.3.10 Constraint -> Presentation Options -> "The constraint string may be placed in a note symbol and attached to each of the symbols for the constrained elements by a dashed line." THEN Either the constrained element is the "note symbol", the "note symbol" represents a Comment and so a Comment adds semantics to another element or I missed something.

Discussion
Just because both a Comment and a Constraint can both be notated using a similar “note symbol” does not mean
they are the same thing. A Constraint notated using a note symbol in the concrete syntax of a model still maps to a
Constraint in the abstract syntax representation, not a Comment.
Disposition: Closed - No Change