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Developing cross-organisational business processes is a challenging task. The partners have to agree on a common data format and meaning as well as on the Quality of Service (QoS) requirements each partner has to fulfill. The QoS requirements are typically described using Service Level Agreements (SLAs) among the partners. In this paper, a top-down modeling approach for Web service based business processes is proposed to capture the functional and non-functional aspects using a choreography language (WSCDL) which describes the message interactions among the participants. The choreography is annotated with SLAs for the different partners.
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