Graphical Message Flow UI has two panels(Left & Right). The Left panel area exhibits message flow viewer. The Right panel exhibits a tab interface with three tabs(Properties, Context, Content).
The viewer panel has three groups Receive Ports, Orchestrations and Send Ports. A service instance of type Receive/Send pipeline will be placed under receive / send ports. An Orchestration service instance will be placed under Orchestrations.
The following image shows representation of service instances with one way port.
In/Out message for a service instance is represented in coloured circle and the colour represents the type of message (receive/transmit)
Service instance with two-way port will be represented as follows: