BPM community has developed a rich set of languages for modeling interactions. In previous work, we argue that business process choreographies are suited for modeling REST-based interactions. To this end, RESTful choreographies have been introduced as an extension of business process choreographies. However, RESTful choreographies do not provide information about the validity of interactions. In this paper, we introduce formal completeness properties. These properties support developers to verify REST-based interactions. The approach is motivated by an example of an examination procedure in the context of a massive open online course.
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