Signals

send draws a send signal action, a convex pentagon. accept draws an accept event action, a concave pentagon. An accept needs no incoming flow, so it may begin an activity instead of start.

diagram activity "Signals"
start
action "Request payment"
send "PaymentRequested"
accept "PaymentConfirmed"
action "Ship goods"
stop

Syntax

send "name"
accept "name"

Specification

UML 2.5.1. Send signal: 16.3.4.3 (p. 455). Accept event: 16.10.4 (p. 474).

Used in

Interrupt service with deferred work, Deployment with parallel checks.