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We present methods and tools to support XML-based requirements engineering for an electronic clearinghouse that connects trading partners in the telecommunications area. The original semi-structured requirements, locally known as business rules, were written as message specifications in a non-standardized and error-prone format using MS Word. To remedy the resulting software failures and faults, we first formalized the requirements by designing an W3C XML Schema for the precise definition ofdoi:10.1016/j.infsof.2005.01.005 fatcat:odyb4w5ohvdftop33hxx6qy77i