Chapter 2 Messages This chapter provides an overview of EMS messages. Topics • EMS Extensions to JMS Messages • JMS Message Structure • Message Priority • Message Delivery Modes • How EMS Manages Persistent Messages • Store Messages in Multiple Stores • Character Encoding in Messages • Message Compression • Message Acknowledgement • Message Selectors • Data Type Conversion • Sending Messages Synchronously and Asynchronously • Receiving Messages Synchronously and Asynchronously