In this work we present the desing and implementation of a new system for proof explanation in the Semantic Web, using defeasible logic. Trust is a vital feature for Semantic Web. If users (humans and agents) are to use and integrate system answers, they must trust them. Thus, systems should be able to explain their actions, sources, and beliefs. Our system produces automatically proof explanations using a popular logic programming system (XSB), by interpreting the output from the proof's trace and convert it to a meaningfull representation. It presents the explanation of an answer for a user's query back to him using a graphical interface, and also it can use an XML representation for agent communication, that is a common scenario in the Semantic Web. One of the main benefits of our system is that it supports explanations in defeasible logic for both positive and negative answers in user queries. In the remaining of this report we present the design and implementation of the system, a novel XML language for the represantation of a proof explanation, and we give a variety of examples and use cases of our system.
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