In Unified Modeling Language (UML) sequence diagrams, you can add covered lifelines to combined fragments to visually represent constructs in interaction instances.
Parent topic: Developing combined fragments
Related concepts
Combined fragments
Lifelines
Related tasks
Creating combined fragments
Removing covered lifelines from combined fragments
Adding interaction operands to combined fragments
Removing interaction operands from combined fragments
Moving interaction operands within combined fragments
Resizing interaction fragments
Adding guard conditions to interaction operands