About MessageIN A MessageIN Event is configured to receive StreamServe XML input data that matches the structure described in an SXD file. The configuration tool for this type of Event is the MessageIN tool. When to use MessageIN Events The original purpose of the MessageIN Event was to make it possible to extend the processing chain over multiple StreamServers. In this case, the MessageIN Event is always used together with a MessageOUT Process. For information about MessageOUT, see About MessageOUT . The scope for the MessageIN Event is now extended to handle any type of StreamServe XML input that can be described in an SXD file. Configuration tasks • Describe the structure of input data in an SXD file. See Describing input data. • Create the MessageIN Event. See Creating a MessageIN Event.