I like this approach to distributed web services in a course. "The paper (20 page PDF) presents a Service-Oriented Architecture (SOA) approach to minimize the cost and time associated with the development of E-Learning systems. The paper illustrates the development of independent E-Learning web services and how they can be combined to implement the required policies of respective education institutes." Illustrated is a system where content, forums, quizzes and assignments are each on their own API-accessible server. The article is a bit technical, and could be more up-to-date, but the essential idea is (in my view) sound.
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