Unified Modeling Language Reference Manual, The, Second Edition
by James Rumbaugh, Ivar Jacobson, Grady Booch
comment
An annotation attached to an element or a collection of elements. A comment has no direct semantics, but it may display semantic information or other information meaningful to the modeler or to a tool, such as a constraint or method body.
See also note.
Semantics
A comment contains a text string, but it may also include embedded documents if a modeling tool permits. A comment may be attached to a model element, a presentation element, or a set of elements. It provides a text description of arbitrary information, but it has no semantic impact. Comments provide information to modelers and may be used to search models.
Notation
Comments are displayed in note symbols, which are shown as rectangles with bent upper-right corners (“dog ears”) ...
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