Whether or not an ESB should host services is a debatable topic and there is no right answer to it. Some do like to host services on their ESB while the others like to have their service deployment separated from service mediation. I personally like the idea of having my services separated from the mediations.
The WSO2 ESB (Enterprise Service Bus) did not allow deploying services on it right up to the 1.7 release. But we did have a few customers who wanted that feature. Now with the revolutionary WSO2 Carbon framework (Which all future generations of WSO2 products will be built on) users can have their ESB just the way they want. The traditionalist who prefer to have there services separate from mediations could use WSO2 WSAS and the WSO2 ESB. For those who want service deployment on their ESB, its just a matter of grabbing the service deployment components and dropping it into your ESB. Charitha has written a nice little blog post that explains how this could be done.
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