Proofs justify how we arrived at a conclusion given a set of facts and rules that we’re allowed to apply. On the Semantic Web, a proof lets a machine explain precisely how it obtained a certain result. Although usually reserved for static data, in this chapter, proofs will play a crucial role in the dynamic world of Web APIs. With some creativity, they can guarantee the correctness of a composition of several Web APIs before its execution, and even serve as an efficient method to automatically create such compositions.
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