While BPEL sensors are used to declare interest in specific events throughout the life cycle of a BPEL process instance, composite sensors provide a method for implementing trackable fields on messages. Composite sensors enable you to perform the following tasks:

• Monitor incoming and outgoing messages.

• Publish JMS data computed from incoming and outgoing messages.

• Track composite instances initiated through business event subscriptions.

For information about composite sensors, see Defining Composite Sensors .