Comparisons
Although similar in concept to an enterprise service bus (ESB), an EMS places emphasis on design of messaging protocols (for instance, using AMQP), not the implementation of the services using a specific technology such as web services or Java Message Service (JMS).
Note that an Enterprise Messaging System should not be confused with an electronic mail system used for delivering human readable text messages to individual people.
An example of a specific application programming interface (API) that implements an enterprise messaging system is the Java Message Service. Although this is an API it embodies many of the same issues involved in setting up a full EMS.
Policy statements may also be extracted from a centralized policy server. These policy statements can be expressed in the XML Access Control Markup Language (XACML).
Read more about this topic: Enterprise Messaging System
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“I don’t like comparisons with football. Baseball is an entirely different game. You can watch a tight, well-played football game, but it isn’t exciting if half the stadium is empty. The violence on the field must bounce off a lot of people. But you can go to a ball park on a quiet Tuesday afternoon with only a few thousand people in the place and thoroughly enjoy a one-sided game. Baseball has an aesthetic, intellectual appeal found in no other team sport.”
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