Managing combined fragments in sequence diagrams

Creating combined fragments in sequence diagrams
In sequence diagrams, you can create combined fragments to visually represent constructs, such as options, alternatives, loops, in interactions. Each type of combined fragment is defined by its operator.
Adding and removing covered lifelines to and from combined fragments in sequence diagrams
In sequence diagrams, you can add and remove covered lifelines to combined fragments to visually represent constructs in interaction instances.
Adding interaction operands to combined fragments in sequence diagrams
In sequence diagrams, an interaction operand is a container that groups interactions. An interaction operand is created automatically when you create a combined fragment. You can add new interaction operands to combined fragments or add additional interaction operands to combined fragment types that allow multiple operands, such as alternative, parallel, strict, or weak combined fragments.
Removing interaction operands from combined fragments in sequence diagrams
In sequence diagrams, you can remove interaction operands from combined fragments that contain multiple interaction operands. Otherwise, you must delete entire combined fragments to remove interaction operands.
Moving interaction operands within combined fragments
In sequence diagrams, you can move the positions of interaction operands in combined fragments.
Resizing combined fragments in sequence diagrams
In sequence diagrams, you can vertically resize combined fragments and you can horizontally resize interaction fragments to make a diagrams easier to read.
Adding guard conditions to interaction operands in sequence diagrams
In sequence diagrams, a guard condition, or an interaction constraint, is a semantic condition or restriction in an interaction operand within a combined fragment. A guard condition is created automatically when you create a combined fragment. You can also manually add a guard condition in an interaction operand that does not have an existing guard condition.

Parent topic: Visually developing behavioral features of applications by using sequence diagrams

Related concepts

Combined fragments in sequence diagrams

Managing lifelines in sequence diagrams

Creating and editing messages on lifelines in sequence diagrams

Adding execution specifications to interactions in sequence diagrams

Referencing interactions from within other interactions in sequence diagrams