3.3.4 Higher-Layer Triggered Events
When the processing of these higher-layer events results in a message being sent to the XA Subordinate Transaction Manager Facet, it is assumed that the processing waits for a response before continuing. This act of waiting for a response action is also specified in the processing descriptions where applicable. The processing that occurs after a response is received is further defined in Processing Events and Sequencing Rules (section 3.3.5).