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This chapter is from the book 16.5 Note Symbols: Notes, Comments, Constraints, and Method Bodies

16.5 Note Symbols: Notes, Comments, Constraints, and Method Bodies

Note symbols can be used on any UML diagram, but are especially common on class diagrams. A UML note symbol is displayed as a dog-eared rectangle with a dashed line to the annotated element; they’ve already been used throughout the book (for example, Figure 16.6). A note symbol may represent several things, such as:

  • a UML note or comment, which by definition have no semantic impact
  • a UML constraint, in which case it must be encased in braces ‘{…}’ (see Figure 16.14)
  • a method body—the implementation of a UML operation (see Figure 16.7)
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