Service Oriented Architectures (SOA) derive their potential from extending the Object Oriented (OO) paradigm as well as some facets of Aspect Oriented (AO) programming to the level of applications and/or whole systems. The Enterprise Service Bus (ESB) is one part of SOAs that can provide a starting point on which to build an SOA or Enterprise Application Integration (EAI) substructure and can provide an insightful view to begin understanding how SOAs work.
One interesting open source ESB named Mule is a good example of a foundation on which an organization can begin to implement a SOA.
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