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Transformation of XML documents is typically understood as noninteractive. In contrast, we formulate the specific task of XML–based transformation of knowledge contained in semi–formal documents, which heavily depends on human understanding of element content and thus requires frequent user intervention. Yet, many aspects of this process are predetermined, and their automation is highly desirable. We implemented a software tool (called Stepper) supporting interactive step–by–step transformation of ‚knowledge blocks‘. The transformation.