In UML, Comments are annotations that can be attached to most elements within UML diagrams. Their primary function is not to affect the semantics of the model directly but to provide useful information to anyone reading the model. Comments can help explain or clarify design decisions, make notes about specific parts of the model, or provide any other context necessary for understanding the model better.
The role of Comments in UML is not to enable automatic generation of code comments or to add constraints or semantics to model elements, although they can be associated with model elements to highlight or explain specific attributes or relationships.
References:
* UML 2.x Superstructure Specification: This document describes Comments as a way to provide human-readable descriptions and notes that do not impact the execution or structure of the model but are crucial for documentation and understanding.
* UML 2.x Infrastructure Specification: Further delineates the role of comments in providing clarifications and additional information useful for model interpretation.