A Legend is a model element used to define different styles of diagram symbols. It allows you to visually group the symbols displayed in a diagram using the style defined for particular Legend Items. You may create a unique style for each Legend Item by specifying its adornment properties (e.g., fill color, text color and custom icons). Legend Items may be applied either to specific model elements or the elements that meet a defined condition. When you modify the adornment of a Legend Item, the affected diagram symbols are automatically updated.
For more information about working with legends, see the following pages: