In Unified Modeling Language (UML) sequence diagrams, a guard condition, or an interaction constraint, is a semantic condition or restriction in an interaction operand within a combined fragment. You can add guard conditions to interaction operands.
Parent topic: Developing combined fragments
Related concepts
Combined fragments
Interaction operands
Guard conditions
Related tasks
Creating combined fragments
Adding lifelines to 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