Abstract. The automation of business processes spanning organizations requires the formal specification of so-called B2B protocols, which define the interfaces of cooperating business software systems thereby enabling interoperability and loose coupling. Currently, there are two main approaches proposed for the specification of B2B protocols, the WSDLbased approach supporting Web Service languages, and the ebXMLbased approach supporting languages defined along the ebXML project. This paper describes an example B2B protocol specification using either approach based on a common scenario, in order to provide an understanding of the respective approaches and their differences at the source code level.
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