Technically, the main difference between the ESB and former EAI solutionsis that it replaces all direct application connections through reliable, secure andmanageable virtual channels. Through the introduction of these virtual channelsthe applications are also decoupled, which leads to loosely coupled interactionsand interfaces. To allow a standardized message exchange between different businessservices, ESB also propagates the use of XML as data format and SOAP[26] as message exchange protocol.
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